Chapter 26: Cognitive Development in Middle Adulthood

Chapter 26 Learning Objectives

  • Describe crystallized versus fluid intelligence
  • Describe research from the Seattle Longitudinal Study
  • Explain the importance of flow to creativity and life satisfaction
  • Describe how middle adults are turning to college for advanced training
  • Describe the difference between an expert and a novice
  • Describe the changes in the U.S. workforce, especially among middle adults
  • Explain the importance of leisure to mental health and a successful retirement

Crystalized versus Fluid Intelligence

Intelligence is influenced by heredity, culture, social contexts, personal choices, and certainly age. One distinction in specific intelligence noted in adulthood is between fluid intelligence, which refers to the capacity to learn new ways of solving problems and performing activities quickly and abstractly and crystallized intelligence, which refers to the accumulated knowledge of the world we have acquired throughout our lives (Salthouse, 2004). This intelligence is distinct, and crystallized intelligence increases with age, while fluid intelligence tends to decrease with age (Horn, Donaldson, & Engstrom, 1981; Salthouse, 2004).

Research demonstrates that older adults have more crystallized intelligence as reflected in semantic knowledge, vocabulary, and language. As a result, adults generally outperform younger people on measures of history, geography, and even on crossword puzzles, where this information is useful (Salthouse, 2004). It is this superior knowledge, combined with a slower and more complete processing style, along with a more sophisticated understanding of the workings

of the world around them, that gives older adults the advantage of “wisdom” over the advantages of fluid intelligence which favors the young (Baltes, Staudinger, & Lindenberger, 1999; Scheibe, Kunzmann, & Baltes, 2009).
The differential changes in crystallized versus fluid intelligence help explain why older adults do not necessarily show poorer performance on tasks that also require experience (i.e., crystallized intelligence), although they show poorer memory overall. A young chess player may think more quickly, for instance, but a more experienced chess player has more knowledge to draw on.
Seattle Longitudinal Study: The Seattle Longitudinal Study has tracked the cognitive abilities of adults since 1956. Every seven years the current participants are evaluated, and new individuals are also added. Approximately 6000 people have participated thus far, and 26 people from the original group are still in the study today. Current results demonstrate that middle-aged adults perform better on four out of six cognitive tasks than those same individuals did when they were young adults. Verbal memory, spatial skills, inductive reasoning (generalizing from particular examples), and vocabulary increase with age until one’s 70s (Schaie, 2005; Willis & Shaie, 1999). However, numerical computation and perceptual speed decline in middle and late adulthood (see Figure 8.18).
Cognitive skills in the aging brain have been studied extensively in pilots, and similar to the Seattle Longitudinal Study results, older pilots show declines in processing speed and memory capacity, but their overall performance seems to remain intact. According to Phillips (2011), researchers tested pilots age 40 to 69 as they performed on flight simulators. Older pilots took longer to learn to use the simulators but performed better than younger pilots at avoiding collisions.

Flow is the mental state of being completely present and fully absorbed in a task (Csikszentmihalyi, 1990). When in a state of flow, the individual is able to block outside distractions and the mind is fully open to producing. Additionally, the person is achieving great joy or intellectual satisfaction from the activity and accomplishing a goal. Further, when in a state of flow, the individual is not concerned with extrinsic rewards. Csikszentmihalyi (1996) used his theory of flow to research how some people exhibit high levels of creativity as he believed that a state of flow is an important factor in creativity (Kaufman & Gregoire, 2016). Other characteristics of creative people identified by Csikszentmihalyi (1996) include curiosity and drive, value for intellectual endeavors, and an ability to lose our sense of self and feel a part of something greater. In addition, he believed that the tortured creative person was a myth and that creative people were very happy with their lives. According to Nakamura and Csikszentmihalyi (2002), people describe flow as the height of enjoyment. The more they experience it, the more they judge their lives to be gratifying. The qualities that allow for flow are well-developed in middle adulthood.

Tacit knowledge is the knowledge that is pragmatic or practical and learned through experience rather than explicitly taught, and it also increases with age (Hedlund, Antonakis, & Sternberg, 2002). Tacit knowledge might be thought of as “know-how” or “professional instinct.” It is referred to as tacit because it cannot be codified or written down. It does not involve academic knowledge, rather it involves being able to use skills and to problem-solve in practical ways. Tacit knowledge can be understood in the workplace and used by blue-collar workers, such as carpenters, chefs, and hairdressers.

Middle Adults Returning to Education 

Midlife adults in the United States often find themselves in college classrooms. In fact, the rate of enrollment for older Americans entering college, often part-time or in the evenings, is rising faster than traditionally aged students. Students over age 35, accounted for 17% of all college and graduate students in 2009, and are expected to comprise 19% of that total by 2020 (Holland, 2014). In some cases, older students are developing skills and expertise in order to launch a second career or to take their career in a new direction. Whether they enroll in school to sharpen particular skills, to retool and reenter the workplace, or to pursue interests that have previously been neglected, older students tend to approach the learning process differently than younger college students (Knowles, Holton, & Swanson, 1998).

The mechanics of cognition, such as working memory and speed of processing, gradually decline with age. However, they can be easily compensated for through the use of higher-order cognitive skills, such as forming strategies to enhance memory or summarizing and comparing ideas rather than relying on rote memorization (Lachman, 2004). Although older students may take a bit longer to learn the material, they are less likely to forget it quickly. Adult learners tend to look for relevance and meaning when learning information. Older adults have the hardest time learning material that is meaningless or unfamiliar. They are more likely to ask themselves, “Why is this important?” when being introduced to information or when trying to memorize concepts or facts. Older adults are more task-oriented learners and want to organize their activity around problem-solving.

Rubin et al. (2018) surveyed university students aged 17-70 regarding their satisfaction and approach to learning in college. Results indicated that older students were more independent, inquisitive, and motivated intrinsically compared to younger students. Additionally, older women processed information at a deeper learning level and expressed more satisfaction with their education.

To address the educational needs of those over 50, The American Association of Community Colleges (2016) developed the Plus 50 Initiative that assists community college in creating or expanding programs that focus on workforce training and new careers for the plus-50 population. Since 2008 the program has provided grants for programs to 138 community colleges affecting over 37, 000 students. The participating colleges offer workforce training programs that prepare 50 plus adults for careers in such fields as early childhood educators, certified nursing assistants, substance abuse counselors, adult basic education instructors, and human resources specialists. These training programs are especially beneficial as 80% of people over the age of 50 say they will retire later in life than their parents or continue to work in retirement, including in a new field.

Gaining Expertise: The Novice and the Expert 

Expertise refers to specialized skills and knowledge that pertain to a particular topic or activity. In contrast, a novice is someone who has limited experiences with a particular task. Everyone develops some level of “selective” expertise in things that are personally meaningful to them, such as making bread, quilting, computer programming, or diagnosing illness. Expert thought is often characterized as intuitive, automatic, strategic, and flexible.

  • Intuitive: Novices follow particular steps and rules when problem-solving, whereas experts can call upon a vast amount of knowledge and past experience. As a result, their actions appear more intuitive than formulaic. Novice cooks may slavishly follow the recipe step by step, while chefs may glance at recipes for ideas and then follow their own procedure.
  • Automatic: Complex thoughts and actions become more routine for experts. Their reactions appear instinctive over time, and this is because expertise allows us to process information faster and more effectively (Crawford & Channon, 2002).
  • Strategic: Experts have more effective strategies than non-experts. For instance, while both skilled and novice doctors generate several hypotheses within minutes of an encounter with a patient, the more skilled clinicians’ conclusions are likely to be more accurate. In other words, they generate better hypotheses than the novice. This is because they are able to discount misleading symptoms and other distractors and hone in on the most likely problem the patient is experiencing (Norman, 2005). Consider how your note-taking skills may have changed after being in school over a number of years.  Chances are you do not write down everything the instructor says, but the more central ideas. You may have even come up with your own short forms for commonly mentioned words in a course, allowing you to take down notes faster and more efficiently than someone who may be a novice academic note taker.
  • Flexible: Experts in all fields are more curious and creative; they enjoy a challenge and experiment with new ideas or procedures. The only way for experts to grow in their knowledge is to take on more challenging, rather than routine tasks.

Expertise takes time. It is a long-process resulting from experience and practice (Ericsson, Feltovich, & Prietula, 2006). Middle-aged adults, with their store of knowledge and experience, are likely to find that when faced with a problem they have likely faced something similar before. This allows them to ignore the irrelevant and focus on the important aspects of the issue. Expertise is one reason why many people often reach the top of their careers in middle adulthood.

However, expertise cannot fully make-up for all losses in general cognitive functioning as we age. The superior performance of older adults in comparison to younger novices appears to be task-specific (Charness & Krampe, 2006). As we age, we also need to be more deliberate in our practice of skills in order to maintain them. Charness and Krampe (2006) in their review of the literature on aging and expertise, also note that the rate of return for our effort diminishes as we age. In other words, increasing practice does not recoup the same advances in older adults as similar efforts do at younger ages.

Work at Midlife 

Who is the U.S. workforce? The civilian, non-institutionalized workforce; the population of those aged 16 and older, who are employed has steadily declined since it reached its peak in the late 1990s when 67% of the civilian workforce population was employed. In 2012 the rate had dropped to 64% and by 2019 it declined to 62.9% (Bureau of Labor Statistics, 2019). The U.S. population is expected to grow more slowly based on census projections for the next few years. Those new entrants to the labor force, adults age 16 to 24, are the only population of adults that will shrink in size over the next few years by nearly half a percent, while those age 55 and up will grow by 2.3% over current rates, and those age 65 to 74 will grow by nearly 4% (Monthly Labor Review (MLR), 2013). In 1992, 26% of the population was 55+, by 2022 it is projected to be 38%. Table 8.8 shows the rates of employment by age. In 2002, baby boomers were between the ages of 38 to 56, the prime employment group. In 2012, the youngest baby boomers were 48 and the oldest had just retired (age 66). These changes might explain some of the steady declines in work participation as this large population cohort ages out of the workforce.

In 2012, 53% of the workforce was male. For both genders and for most age groups the rate of participation in the labor force has declined from 2002 to 2012, and it is projected to decline further by 2022. The exception is among the older middle-age groups (the baby boomers), and especially for women 55 and older.

Hispanic males have the highest rate of participation in the labor force. In 2012, 76% of Hispanic males, compared with 71% of White, 72% of Asians, and 64% of Black men ages 16 or older were employed. Among women, Black women were more likely to be participating in the workforce (58%) compared with almost 57% of Hispanic and Asian, and 55% of White females. The rates for all racial and ethnic groups are expected to decline by 2022 (MLR, 2013).

Climate in the Workplace for Middle-aged Adults: A number of studies have found that job satisfaction tends to peak in middle adulthood (Besen, Matz-Costa, Brown, Smyer, & Pitt- Catsouphers, 2013; Easterlin, 2006). This satisfaction stems from not only higher wages, but often greater involvement in decisions that affect the workplace as they move from worker to supervisor or manager. Job satisfaction is also influenced by being able to do the job well, and after years of experience at a job, many people are more effective and productive. Another reason for this peak in job satisfaction is that at midlife many adults lower their expectations and goals (Tangri, Thomas, & Mednick, 2003). Middle-aged employees may realize they have reached the highest they are likely to in their careers. This satisfaction at work translates into lower absenteeism, greater productivity, and less job-hopping in comparison to younger adults (Easterlin, 2006).

However, not all middle-aged adults are happy in the workplace. Women may find themselves up against the glass ceiling. This may explain why females employed at large corporations are twice as likely to quit their jobs as are men (Barreto, Ryan, & Schmitt, 2009). Another problem older workers may encounter is job burnout, defined as unsuccessfully managed workplace stress (World Health Organization, 2019). Burnout consists of:

  • Feelings of energy depletion or exhaustion
  • Increased mental distance from one’s job, or feelings of job negativism or cynicism
  • Reduced professional efficacy

American workers may experience more burnout than do workers in many other developed nations because most developed nations guarantee by law a set number of paid vacation days (International Labour Organization, ILO, 2011), the United States does not (U.S. Department of Labor, 2016).

Not all employees are covered under overtime pay laws (U.S. Department of Labor, 2016). This is important when you considered that the 40-hour workweek is a myth for most Americans. Only 4 in 10 U.S. workers work the typical 40-hour workweek. The average workweek for many is almost a full day longer (47 hours), with 39% working 50 or more hours per week (Saad, 2014). In comparison to workers in many other developed nations, American workers work more hours per year (Organisation for Economic Cooperation and Development, OECD, 2016). As can be seen in Figure 8.20, Americans work more hours than most European nations, especially western and northern Europe, although they work fewer hours than workers in other nations, especially Mexico.

Challenges in the Workplace for Middle-aged Adults: In recent years middle-aged adults have been challenged by economic downturns, starting in 2001, and again in 2008. Fifty-five percent of adults reported some problems in the workplace, such as fewer hours, pay-cuts, having to switch to part-time, etc., during the most recent economic recession (see Figure 8.21, Pew Research Center, 2010a). While young adults took the biggest hit in terms of levels of unemployment, middle-aged adults also saw their overall financial resources suffer as their retirement nest eggs disappeared and house values shrank, while foreclosures increased (Pew Research Center, 2010b). Not surprisingly this age group reported that the recession hit them worse than did other age groups, especially those aged 50-64. Middle-aged adults who find themselves unemployed are likely to remain unemployed longer than those in early adulthood (U.S. Government Accountability Office, 2012). In the eyes of employers, it may be more cost-effective to hire a young adult, despite their limited experience, as they would be starting out at lower levels of the pay scale. In addition, hiring someone who is 25 and has many years of work ahead of them versus someone who is 55 and will likely retire in 10 years may also be part of the decision to hire a younger worker (Lachman, 2004). American workers are also competing with global markets and changes in technology. Those who are able to keep up with all these changes or are willing to uproot and move around the country or even the world have a better chance of finding work. The decision to move may be easier for people who are younger and have fewer obligations to others.

Leisure

 

As most developed nations restrict the number of hours an employer can demand that an employee work per week, and require employers to offer paid vacation time, what do middle-aged adults do with their time off from work and duties, referred to as leisure? Around the world, the most common leisure activity in both early and middle adulthood is watching television (Marketing Charts Staff, 2014). On average, middle-aged adults spend 2-3 hours per day watching TV (Gripsrud, 2007) and watching TV accounts for more than half of all the leisure time (see Figure 8.22).

In the United States, men spend about 5 hours more per week in leisure activities, especially on weekends, than do women (Drake, 2013; U.S. Bureau of Labor Statistics, 2016). The leisure gap between mothers and fathers is slightly smaller, about 3 hours a week, than among those without children under age 18 (Drake, 2013). Those age 35-44 spend less time on leisure activities than any other age group, 15 or older (U.S. Bureau of Labor Statistics, 2016). This is not surprising as this age group is more likely to be parents and still working up the ladder of their career, so they may feel they have less time for leisure.

Americans have less leisure time than people in many other developed nations. As you read earlier, there are no laws in many job sectors guaranteeing paid vacation time in the United States (see Figure 8.23). Ray, Sanes, and Schmitt (2013) report that several other nations also provide additional time off for young and older workers and for shift workers. In the United States, those in higher-paying jobs and jobs covered by a union contract are more likely to have paid vacation time and holidays (Ray & Schmitt, 2007).

But do U.S. workers take their time off? According to Project Time-Off (2016), 55% of U.S. workers in 2015 did not take all of their paid vacation and holiday leave. A large percentage of this leave is lost. It cannot be rolled over into the next year or paid out. A total of 658 million vacation days or an average of 2 vacation days per worker was lost in 2015. The reasons most often given for not taking time off was worry that there would be a mountain of work to return to (40%), a concern that no one else could do the job (35%), not being able to afford a vacation (33%), feeling it was harder to take time away when you have or are moving up in the company (33%), and not wanting to seem replaceable (22%). Since 2000, more American workers are willing to work for free rather than take the time that is allowed to them. A lack of support from their boss and even their colleagues to take a vacation is often a driving force in deciding to forgo time off. In fact, 80% of the respondents to the survey above said they would take time away if they felt they had support from their boss. Two-thirds reported that they hear nothing, mixed messages, or discouraging remarks about taking their time off. Almost a third (31%) feel they should contact their workplace, even while on vacation.

The benefits of taking time away from work: Several studies have noted the benefits of taking time away from work. It reduces job stress burnout (Nimrod, Kleiber, & Berdychevesky, 2012), improves both mental health (Qian, Yarnal, & Almeida, 2013) and physical health (Stern & Konno, 2009), especially if that leisure time also includes moderate physical activity (Lee et al., 2015). Leisure activities can also improve productivity and job satisfaction (Kühnel & Sonnentag, 2011) and help adults deal with balancing family and work obligations (Lee, et al., 2015).

References

AARP. (2009). The divorce experience: A study of divorce at midlife and beyond. Washington, DC: AARP

Ahlborg, T., Misvaer, N., & Möller, A. (2009). Perception of marital quality by parents with small children: A follow-up study when the firstborn is 4 years old. Journal of Family Nursing, 15, 237–263.

Alterovitz, S. S., & Mendelsohn, G. A. (2013). Relationship goals of middle-aged, young-old, and old-old Internet daters: An analysis of online personal ads. Journal of Aging Studies, 27, 159–165. doi.10.1016/j.jaging.2012.12.006

American Association of Community Colleges (2016). Plus 50 community colleges: Ageless learning. Retrieved from http://plus50.aacc.nche.edu/Pages/Default.aspx

American Cancer Society. (2019). Cancer Facts and Figures 2019. Retrieved from https://www.cancer.org/content/dam/cancer- org/research/cancer-facts-and-statistics/annual-cancer-facts-and-figures/2019/cancer-facts-and-figures-2019.pdf

American Diabetes Association (2016). Standards of medical care in diabetes. Diabetes Care. 39(1), 1-112.

American Heart Association (2016). Saturated fats. Retrieved from http://www.heart.org/HEARTORG/HealthyLiving/HealthyEating/Nutrition/Saturated-Fats_UCM_301110_Article.jsp

American Psychological Association (2017). Stress in America: The state of our nation. Retrieved from https://www.apa.org/images/state-nation_tcm7-225609.pdf

American Psychological Association (2016). By the numbers: Hearing loss and mental health. Monitor on Psychology, 47(4), 9.

Anderson, E. R., & Greene, S. M. (2011). “My child and I are a package deal”: Balancing adult and child concerns in repartnering after divorce. Journal of Family Psychology, 25(5), 741-750.

Anderson, E.R., Greene, S.M., Walker, L., Malerba, C.A., Forgatch, M.S., & DeGarmo, D.S. (2004). Ready to take a chance again: Transitions into dating among divorced parents. Journal of Divorce and Remarriage, 40, 61-75.

Aquilino, W. (1991). Predicting parents’ experiences with coresidence adult children. Journal of Family Issues, 12(3), 323-342.

Arai, Y., Sugiura, M., Miura, H., Washio, M., & Kudo, K. (2000). Undue concern for other’s opinions deters caregivers of impaired elderly from using public services in rural Japan. International Journal of Geriatric Psychiatry, 15(10), 961- 968.

Armour, S. (2007, August 2). Friendships and work: A good or bad partnership? USA Today. Retrieved from http://usatoday30.usatoday.com/money/workplace/2007-08-01-work-friends_N.htm

Avis, N. E., Stellato, R., & Crawford, S. (2001). Is there a menopausal syndrome? Menopausal status and symptoms across racial/ethnic groups. Social Science and Medicine, 52(3), 345-356.

Baltes, P. B., Staudinger, U. M., & Lindenberger, U. (1999). Lifespan Psychology: Theory and Application to Intellectual Functioning. Annual Review of Psychology, 50, 471-507.

Bargh, J. A., McKenna, K. Y. A, & Fitsimons, G. G. (2002). Can you see the real me? Activation and expression of the true self on the Internet. Journal of Social Issues, 58, 33–48.

Barreto, M., Ryan, M. K., & Schmitt, M. T. (2009). The glass ceiling in the 21st century: Understanding the barriers to gender equality. Washington, DC: American Psychological Association.

Baruch, G., & Brooks-Gunn, J. (1984). Women in midlife. New York: Plenum.

Beach, S. R., Schulz, R., Yee, J. L., & Jackson, S. (2000). Negative and positive health effects of caring for a disabled spouse: Longitudinal findings from the caregiver health effects study. Psychology and Aging, 15(2), 259-271.

Beit-Hallahmi, B., & Argyle, M. (1998). Religious behavior, belief, and experience. New York: Routledge.

Bengtson, V. L. (2001). Families, intergenerational relationships, and kinkeeping in midlife. In N. M. Putney (Author) & M. E. Lachman (Ed.), Handbook of midlife development (pp. 528-579). New York: Wiley.

Berglund, L., Oliver, E. H., Fontanez, N., Holleran, S., Matthews, K., Roheim, P. S., & DELTA Investigators. (1999). HDL- subpopulation patterns in response to reductions in dietary total and saturated fat intakes in healthy subjects. American Journal of Clinical Nutrition, 70, 992-1000.

Berkeley Wellness. (2011). The lowdown on low testosterone. Retrieved from http://www.berkeleywellness.com/self- care/sexual-health/article/lowdown-low-testosterone

Besen, E., Matz-Costa, C., Brown, M., Smyer, M. A., & Pitt-Catsouphers, M. (2013). Job characteristics, core self-evaluations, and job satisfaction. International Journal of Aging & Human Development, 76(4), 269-295.

Billings, A. G., & Moos, R. H. (1981). The role of coping responses and social resources in attenuating the stress of life events. Journal of Behavioral Medicine, 4, 139–157.

Birditt, K. S., & Antonucci, T.C. (2012). Till death do us part: Contexts and implications of marriage, divorce, and remarriage across adulthood. Research in Human Development, 9(2), 103-105.

Borland, D. C. (1982). A cohort analysis approach to the empty-nest syndrome among three ethnic groups of women: A theoretical position. Journal of Marriage and the Family, 44, 117–129.

Borzumato-Gainey, C., Kennedy, A., McCabe, B., & Degges-White, S. (2009). Life satisfaction, self-esteem, and subjective age in women across the life span. Adultspan Journal, 8(1), 29-42.

Bouchard, G. (2013). How do parents reaction when their children leave home: An integrative review. Journal of Adult Development, 21, 69-79.

Bromberger, J. T., Kravitz, H. M., & Chang, Y. (2013). Does risk for anxiety increase during the menopausal transition? Study of Women’s Health Across the Nation (SWAN). Menopause, 20(5), 488-495.

Brown, L. H., & DeRycke, S. B. (2010). The kinkeeping connection: Continuity, crisis and consensus. Journal of Intergenerational Relationships, 8(4), 338-353, DOI: 10.1080/15350770.2010.520616

Brown, S. L., & Lin, I. (2013). The gray divorce revolution: Rising divorce among middle aged and older adults 1990-2010. National Center for Family & Marriage Research Working Paper Series. Bowling Green State University. https://www.bgsu.edu/content/dam/BGSU/college-of-arts-and- sciences/NCFMR/ documents/Lin/The-Gray- Divorce.pdf

Bureau of Labor Statistics. (2019). The employment situation-June 2019. Retrieved from: https://www.bls.gov/news.release/pdf/empsit.pdf

Busse, E. W. (1969). Theories of aging. In E. W. Busse & E/. Pfeiffer (Eds.), Behavior and adaptation in later life (pp. 11-31). Boston, MA: Little Brown.

Carmichael, C. L., Reis, H. T., & Duberstein, P. R. (2015). In your 20s it’s quantity, in your 30s it’s quality: The prognostic value of social activity across 30 years of adulthood. Psychology and Aging, 30(1), 95-105.

Carroll, J. L. (2016). Sexuality now: Embracing diversity (5th ed.). Boston, MA: Cengage Learning.

Carver, C. S., Scheier, M. F., & Weintraub, J. K. (1989). Assessing coping strategies: A theoretically based approach. Journal of Personality and Social Psychology, 56, 267–283.

Center for Sexual Health Promotion. (2010). National survey of sexual health and behavior. Retrieved from http://www.sexualhealth.indiana.edu

Centers for Disease Control (2014a). About high blood pressure. Retrieved from http://www.cdc.gov/bloodpressure/about.htm

Centers for Disease Control and Prevention. (2014b). Behaviors that increase the risk for high blood pressure. Retrieved from http://www.cdc.gov/bloodpressure/behavior.htm

Centers for Disease Control and Prevention. (2014c). Measuring high blood pressure. Retrieved from http://www.cdc.gov/bloodpressure/measure.htm

Centers for Disease Control and Prevention. (2014d). National diabetes statistics report, 2014. Retrieved from http://www.cdc.gov/diabetes/pubs/statsreport14/national-diabetes-report-web.pdf

Centers for Disease Control and Prevention. (2014e). Diagnoses of HIV infection among adults aged 50 years and older in the United States and dependent areas 2010–2014. HIV surveillance report, 21(2), 1-69. Retrieved from http://www.cdc.gov/hiv/pdf/library/reports/surveillance/cdc-hiv-surveillance-supplemental-report-vol-21-2.pdf

Centers for Disease Control and Prevention. (2015). Facts about high cholesterol. Retrieved from http://www.cdc.gov/cholesterol/facts.htm

Centers for Disease Control and Prevention. (2016). The National Center for Health Statistics. Retrieved from https://www.cdc.gov/nchs/index.htm

Centers for Disease Control and Prevention. (2017). National diabetes statistics report, 2017. Retrieved from: https://www.cdc.gov/diabetes/pdfs/data/statistics/national-diabetes-statistics-report.pdf

Chang, Y. F., An, Y., Bigel, M., Wong, D. F., Troncoso, J. C., O’Brien, R. J., Breitner, J. C., Ferruci, L., Resnick, S. M., & Thanbisetty, M. (2016). Midlife adiposity predicts earlier onset of Alzheimer’s dementia, neuropathology and presymptomatic cerebral amyloid accumulation. Molecular Psychiatry, 21(7), 910-915.

Charness, N., & Krampe, R. T. (2006). Aging and expertise. In K. Ericsson, N. Charness & P. Feltovich (Eds.), Cambridge Handbook of expertise and expert performance. Cambridge, United Kingdom: Cambridge University Press.

Cherlin, A. J., & Furstenberg, F. F. (1986). The new American grandparent: A place in the family, a life apart. New York: Basic Books.

Cohen, S., & Wills, T. A. (1985). Stress, social support, and the buffering hypothesis. Psychological Bulletin, 98, 310–357.

Crawford, S. & Channon, S. (2002). Dissociation between performance on abstract tests of executive function and problem solving in real life type situations in normal aging. Aging and Mental Health, 6, 12-21.

Crist, L. A., Champagne, C. M., Corsino, L., Lien, L. F., Zhang, G., & Young, D. R. (2012). Influence of change in aerobic fitness and weight on prevalence of metabolic syndrome. Preventing Chronic Disease 9,110171. doi: http://dx.doi.org/10.5888/pcd9.110171

Crowson, C. S., Matteson, E. L., Myasoedova, E., Michet, C. J., Ernste, F. C., Warrington, K. J., …Gabriel, S. E. (2011). The lifetime risk of adult-onset rheumatoid arthritis and other inflammatory autoimmune rheumatic diseases. Arthritis and Rheumatism, 63(3), 633-639. doi: 10.1002/art.30155.

Csikszentmihalyi, M. (1990). Flow: The psychology of optimal experience. New York: Harper Perennial Modern Classics.

Csikszentmihalyi, M. (1996). Creativity: Flow and the psychology of discovery and invention. New York: Harper

Collins. Dawes, P., DicMonrokinson, C., Emsley, R., Bishop, P. N., Cruickshanks, K. J., Edmundson-Jones, M., …. Munro, K. (2014). Vision impairment and dual sensory problems in middle age. Ophthalmic Physiological Optics, 34, 479–488. doi: 10.1111/opo.12138479

Degges-White, S., & Myers, J, E. (2006). Women at midlife: An exploration of chronological age, subjective age, wellness, and life satisfaction, Adultspan Journal, 5, 67-80.

DeLongis, A., Folkman, S., & Lazarus, R. S. (1988). The impact of daily stress on health and mood: Psychological and social resources as mediators. Journal of Personality and Social Psychology, 54, 486–495.

Dennerstein, L., Dudley, E., & Guthrie, J. (2002). Empty nest or revolving door? A prospective study of women’s quality of life in midlife during the phase of children leaving and re-entering the home. Psychological Medicine, 32, 545–550.

DePaulo, B. (2014). A singles studies perspective on mount marriage. Psychological Inquiry, 25(1), 64-68. doi: 10.1080/1047840X.2014.878173

Desilver, D. (2016). In the U. S. and abroad, more young adults are living with their parents. Retrieved from: https://www.pewresearch.org/fact-tank/2016/05/24/in-the-u-s-and-abroad-more-young-adults-are-living-with-their- parents/

de St. Aubin, E., & Mc Adams, D. P. (1995). The relation of generative concern and generative action to personality traits, satisfaction/happiness with life and ego development. Journal of Adult Development, 2, 99-112.

De Vaus, D. & McAllister, I. (1987). Gender differences in religion: A test of the structural location theory. American Sociological Review, 52, 472-481.

Dew, M. A., Hoch, C. C., Buysse, D. J., Monk, T. H., Begley, A. E., Houck, P. R.,…Reynolds, C. F., III. (2003). Healthy older adults’ sleep predicts all-cause mortality at 4 to 19 years of follow-up. Psychosomatic Medicine, 65(1), 63–73.

Dimah, K., & Dimah, A. (2004). Intimate relationships and sexual attitudes of older African American men and women. The Gerontologist, 44, 612-613.

Drake, B. (2013). Another gender gap: Men spend more time in leisure activities. Pew Research Center. Retrieved from http://www.pewresearch.org/fact-tank/2013/06/10/another-gender-gap-men-spend-more-time-in-leisure-activities/

Dunér, A., & Nordstrom, M. (2007). The roles and functions of the informal support networks of older people who receive formal support: A Swedish qualitative study. Ageing & Society, 27, 67– 85. doi:10.1017/ S0144686X06005344

Easterlin, R. A. (2006). Life cycle happiness and its sources: Intersections of psychology, economics, and demography. Journal of Economic Psychology, 27, 463-482.

Eastley, R., & Wilcock, G. K. (1997). Prevalence and correlates of aggressive behaviors occurring in patients with Alzheimer’s disease. International Journal of Geriatric Psychiatry, 12, 484-487.

Elsesser, L., & Peplau, L. A. (2006). The glass partition: Obstacles to cross-sex friendships at work. Human Relations, 59(8), 1077–1100.

Emslie, C., Hunt, K., & Lyons, A. (2013. The role of alcohol in forging and maintaining friendships amongst Scottish men in midlife. Health Psychology, 32(10, 33-41.

Ericsson, K. A., Feltovich, P. J., & Prietula, M. J. (2006). Studies of expertise from psychological perspectives. In K. Ericsson, N. Charness & P. Feltovich (Eds.), Cambridge Handbook of expertise and expert performance. Cambridge, UK: Cambridge University Press.

Erikson, E. (1950). Childhood and society. New York: Norton & Company. Erikson, E. (1959). Identity and the life cycle. New York: Norton & Company. Erikson, E. (1982). The life cycle completed. New York: Norton & Company.

Fehr, B. (2008). Friendship formation. In S. Sprecher, A. Wenzel, & J. Harvey (Eds.), Handbook of Relationship Initiation (pp.29–54). New York, NY: Psychology Press.

Ferrie, J. E., Shipley, M. J., Cappuccio, F. P., Brunner, E., Miller, M. A., Kumari, M., & Marmot, M. G. (2007). A prospective study of change in sleep duration: Associations with mortality in the Whitehall II cohort. Sleep, 30(12), 1659.

Ford, E. S., Li, C., & Zhao, G. (2010). Prevalence and correlates of metabolic syndrome based on a harmonious definition among adults in the US. Journal of Diabetes, 2(3), 180-193.

Friedman, M., & Rosenman, R. (1959). Association of specific overt behaviour pattern with blood and cardiovascular findings. Journal of the American Medical Association, 169, 1286–1296.

Fry, R. (2017). It’s becoming more common for young adults to live at home-and for longer stretches. Retrieved from: https://www.pewresearch.org/fact-tank/2017/05/05/its-becoming-more-common-for-young-adults-to-live-at-home-and- for-longer-stretches/ft_17-05-03_livingathome_bygen2/

Füllgrabe, C., Moore, B. C. J., & Stone, M. A. (2015). Age-group differences in speech identification despite matched audio metrically normal hearing: contributions from auditory temporal processing and cognition. Frontiers in Aging Neuroscience, 6, 1-25. doi:10.3389/fnagi.2014.00347

Fung, H. H. (2013). Aging in culture. Gerontologist, 53(3), 369-377.

Gerstel, N., & Gallagher, S. K. (1993). Kinkeeping and distress: Gender, recipients of care, and work–family conflict. Journal of Marriage and the Family, 55, 598–607.

Gibbons, C., Creese, J., Tran, M., Brazil, K., Chambers, L., Weaver, B., & Bedard, M. (2014). The psychological and health consequences of caring for a spouse with dementia: A critical comparison of husbands and wives. Journal of Women & Aging, 26, 3-21.

Gilleard, C., & Higgs, P. (2000). Cultures of aging: Self, citizen and the body. Upper Saddle River, NJ: Prentice Hall Publishers.

Goldscheider, F., & Kaufman, G. (2006). Willingness to stepparent: Attitudes about partners who already have children. Journal of Family Issues, 27, 1415 – 1436.

Goldscheider, F., & Sassler, S. (2006). Creating stepfamilies: Integrating children into the study of union formation. Journal of Marriage and Family, 68, 275 – 291.

Gorchoff, S. M., John, O. P., & Helson, R. (2008). Contextualizing change in marital satisfaction during middle age. Psychological Science, 19, 1194–1200.

Gottman, J. M., & Levenson, R. W. (2000). The timing of divorce: Predicting when a couple will divorce over a 14-year period. Journal of Marriage & the Family, 62, 737-745.

Greene, S. M., Anderson, E. R., Hetherington, E., Forgtch, M. S., & DeGarmo, D. S. (2003). Risk and resilience after divorce. In F. Walsh (Ed.), Normal family processes: Growing diversity and complexity (3rd ed., pp. 96-120). New York: Guilford Press.

Greenfield, E. A., & Marks, N. F. (2006). Linked lives: Adult children’s problems and their parents’ psychological and relational well-being. Journal of Marriage and Family, 68, 442-454.

Greenfield, E. A., Vaillant, G. E., & Marks, N. F. (2009). Do formal religious participation and spiritual perceptions have independent linkages with diverse dimensions of psychological well-being? Journal of Health and Social Behavior, 50, 196-212.

Gripsrud, J. (2007). Television and the European public sphere. European Journal of Communication, 22, 479-492.

Grzywacz, J. G. & Keyes, C. L. (2004). Toward health promotion: Physical and social behaviors in complete health. Journal of Health Behavior, 28(2), 99-111.

Ha, J., Hong, J., Seltzer, M. M., & Greenberg, J. S. (2008). Age and gender differences in the well-being of midlife and aging parents with children with mental health or developmental problems: Report of a national study. Journal of Health and Social Behavior, 49, 301-316.

Harrison, J., Barrow, S., Gask, L., & Creed, F. (1999). Social determinants of GHQ score by postal survey. Journal of Public Health Medicine, 21, 283–288. doi:10.1093/pubmed/21.3.283

Hawkley, L. C., Hughes, M. E., Waite, L. J., Masi, C. M., Thisted, R. A., & Cacioppo, J. T. (2008). From social structural factors to perceptions of relationship quality and loneliness: The Chicago health, aging, and marital status transitions and health outcomes social relations study. The Journals of Gerontology: Series B: Psychological Sciences and Social Sciences, 63, 375–384. doi:10.1093/geronb/ 63.6.S375

Hayslip Jr., B., Henderson, C. E., & Shore, R. J. (2003). The Structure of Grandparental Role Meaning. Journal of Adult Development, 10(1), 1-13.

Hedlund, J., Antonakis, J., & Sternberg, R. J. (2002). Tacit knowledge and practical intelligence: Understanding the lessons of experience. Retrieved from http://www.au.af.mil/au/awc/awcgate/army/ari_tacit_knowledge.pdf

Herman-Stabl, M. A., Stemmler, M., & Petersen, A. C. (1995). Approach and avoidant coping: Implications for adolescent mental health. Journal of Youth and Adolescence, 24, 649–665.

Hetherington, E. M. & Kelly, J. (2002). For better or worse: Divorce reconsidered. New York, NY: Norton.

Holland, K. (2014). Why America’s campuses are going gray. CNBC. Retrieved from http://www.cnbc.com/2014/08/28/why- americas-campuses-are-going-gray.html

Holt-Lunstad, J., Smith, T. B., & Layton, J. B. (2010). Social relationships and mortality risk: a meta-analytic review. PLoS Medicine, 7(7), e1000316.

Hooker, E., & Pressman, S. (2016). The healthy life. NOBA. Retrieved from http://nobaproject.com/modules/the-healthy-life

Horn, J. L., Donaldson, G., & Engstrom, R. (1981). Apprehension, memory, and fluid intelligence decline in adulthood. Research on Aging, 3(1), 33-84.

House, J. S., Landis, K. R., & Umberson, D. (1988). Social relationships and health. Science, 241, 540–545

Hu, G., Qiao, Q., Tuomilehto, J., Balkau, B., Borch, Johnsen, K., & Pyorala, K. (2004). Prevalence of metabolic syndrome and its relation to all-cause and cardiovascular mortality in non-diabetic European men and women. Archives of Internal Medicine, 164(10), 1066-1076.

Huang, J. (2007). Hormones and female sexuality. In M. Tepper & A. F. Owens (Eds.), Sexual Health, Vol 2: Physical Foundations (pp. 43-78). Westport, CT: Praeger.

Humes, L. E., Kewley-Port, D., Fogerty, D., & Kinney, D. (2010). Measures of hearing threshold and temporal processing across the adult lifespan. Hearing Research, 264(1/2), 30-40. doi:10.1016/j.heares.2009.09.010

International Labour Organization. (2011). Global Employment Trends: 2011. Retrieved from http://www.ilo.org/wcmsp5/groups/public/@dgreports/@dcomm/@publ/documents/publication/wcms_150440.pdf

Iribarren, C., Sidney, S., Bild, D. E., Liu, K., Markovitz, J. H., Roseman, J. M., & Matthews, K. (2000). Association of hostility with coronary artery calcification in young adults. Journal of the American Medical Association, 283, 2546–2551.

Jackson, G. R. & Owsley, C. (2000). Scotopic sensitivity during adulthood. Vision Research, 40 (18), 2467-2473. doi:10.1016/S0042-6989(00)00108-5

Jones, J. M. (2013). In U.S., 40% Get Less than Recommended Amount of Sleep. Gallup. Retrieved from http://www.gallup.com/poll/166553/less-recommended- amount sleep.aspx?g_source=sleep%202013&g_medium=search&g_campaign=tiles

Kagawa-Singer, M., Wu, K., & Kawanishi, Y. (2002). Comparison of the menopause and midlife transition between Japanese American and European American women. Medical Anthropology Quarterly, 16(1), 64-91.

Kang, S. W., & Marks, N. F. (2014). Parental caregiving for a child with special needs, marital strain, and physical health: Evidence from National Survey of Midlife in the U.S. 2005. Contemporary Perspectives in Family Research, 8A, 183- 209.

Karakelides, H., & Nair, K. S. (2005). Sarcopenia of aging and its metabolic impact. Current Topics in Developmental Biology, 68, 123-148.

Kasper, T. (2015). Why you only need 7 hours of sleep. American Academy of Sleep Medicine. Retrieved from http://sleepeducation.org/news/2015/06/03/why-you-only-need-7-hours-of-sleep

Kaufman, B. E., & Hotchkiss, J. L. 2003. The economics of labor markets (6th ed.). Mason, OH: Thomson South-Western.

Kaufman, S. B., & Gregoire, C. (2016). How to cultivate creativity. Scientific American Mind, 27(1), 62-67.

Kaur, S., Walia, I., & Singh, A. (2004). How menopause affects the lives of women in suburban Chandigarh, India. Climacteric, 7(2), 175-180.

Knowles, M. S., Holton, E. F., & Swanson, R. A. (1998). The adult learner: A neglected species. Houston: Gulf Pub., Book Division.

Kochanek, K. D., Murphy, S. L., Xu, J., & Arias, E. (2019). Deaths: Final data for 2017. National Vital Statistics Reports, 68(9), 1-77.

Kouzis, A. C., & Eaton, W. W. (1998). Absence of social networks, social support, and health services utilization. Psychological Medicine, 28, 1301–1310. doi:10.1017/S0033291798007454

Krause, N. A., Herzog, R., & Baker, E. (1992). Providing support to others and well-being in later life. Journal of Gerontology: Psychological Sciences, 47, P300-311.

Kühnel, J., & Sonnentag, S. (2011). How long do you benefit from vacation? A closer look at the fade-out vacation effects. Journal of Organizational Behavior, 32, 125-143.

Kushida, C. (2005). Sleep deprivation: basic science, physiology, and behavior. London, England: Informal Healthcare.

Lachman, M. E. (2004). Development in midlife. Annual Review of Psychology, 55(1), 305-331. doi: 10.1146/annurev.psych.55.090902.141521

Landsford, J. E., Antonucci, T.C., Akiyama, H., & Takahashi, K. (2005). A quantitative and qualitative approach to social relationships and well-being in the United States and Japan. Journal of Comparative Family Studies, 36, 1-22.

Leach, M. S., & Braithwaite, D. O. (1996). A binding tie: Supportive communication of family kinkeepers. Journal of Applied Communication Research, 24, 200–216.

Lee, B., Lawson, K. M., Chang, P., Neuendorf, C., Dmitrieva, N. O., & Ameida, D. H. (2015). Leisure-time physical activity moderates the longitudinal associations between work-family spillover and physical health. Journal of Leisure Research, 47(4), 444-466.

Levinson, D. J. (1978). The seasons of a man’s life. New York: Knopf.

Livingston, G. (2014). Four in ten couples are saying I do again. In Chapter 3. The differing demographic profiles of first-time marries, remarried and divorced adults. Pew Research Center. Retrieved from http://www.pewsocialtrends.org/2014/11/14/chapter-3-the-differing-demographic-profiles-of-first-time-married- remarried-and-divorced-adults/

Madden, S., St Pierre-Hansen, N., & Kelly L. (2010). First Nations women’s knowledge of menopause: Experiences and perspectives. Canadian Family Physician, 56(9), e331-e337.

Malik, S. (2004). Impact of the metabolic syndrome on mortality from coronary heart disease, cardiovascular disease, and all causes in United States adults. Circulation, 110(10), 1245-1250.

Malone, J. C., Liu, S. R., Vaillant, G. E., Rentz, D. M., & Waldinger, R. J. (2016). Midlife Eriksonian psychosocial development: Setting the stage for late-life cognitive and emotional health. Developmental Psychology, 52(3), 496-508.

Marketing Charts Staff. (2014). Are young people watching less TV? Retrieved from http://www.marketingcharts.com/television/are-young-people-watching-less-tv-24817/

Martin, L. J. (2014). Aging changes in hair and nails. U.S. National Library of Medicine. Retrieved from https://www.nlm.nih.gov/medlineplus/ency/article/004005.htm

Matthews, K. A., Glass, D. C., Rosenman, R. H., & Bortner, R. W. (1977). Competitive drive, pattern A, and coronary heart disease: A further analysis of some data from the Western Collaborative Group Study. Journal of Chronic Diseases, 30, 489–498.

Mayo Clinic. (2014a). Heart disease. Retrieved from http://www.mayoclinic.org/diseases-conditions/heart- disease/basics/definition/con-20034056

Mayo Clinic. (2014b). Metabolism and weight loss: How you burn calories. Retrieved from http://www.mayoclinic.org/healthy- lifestyle/weight-loss/in-depth/metabolism/art-20046508

McKenna, K. A. (2008) MySpace or your place: Relationship initiation and development in the wired and wireless world. In S. Sprecher, A. Wenzel, & J. Harvey (Eds.), Handbook of relationship initiation (pp. 235–247). New York, NY: Psychology Press.

McKenna, K. A., Green, A. S., & Gleason, M. E. J. (2002). Relationship formation on the Internet: What’s the big attraction? Journal of Social Issues, 58, 9–31.

Metlife. (2011). Metlife study of caregiving costs to working caregivers: Double jeopardy for baby boomers caring for their parents. Retrieved from http://www.caregiving.org/wp-content/uploads/2011/06/mmi-caregiving-costs-working- caregivers.pdf

Maillard, P., Sashardi, S., Beiser, A., Himail, J. J., Au, R., Fletcher, E., …. DeCarli, C. (2012). Effects of systolic blood pressure on white-matter integrity in young adults in the Farmington Heart Study: A cross-sectional study. The Lancet: Neurology, 11(12), 1039-1047.

Miller, T. Q., Smith, T. W., Turner, C. W., Guijarro, M. L., & Hallet, A. J. (1996). Meta-analytic review of research on hostility and physical health. Psychological Bulletin, 119, 322–348.

Mitchell, B. A., & Lovegreen, L. D. (2009). The empty nest syndrome in midlife families: A multimethod exploration of parental gender differences and cultural dynamics. Journal of Family Issues, 30, 1651–1670.

Montenegro, X. P. (2003). Lifestyles, dating, and romance: A study of midlife singles. Washington, DC: AARP.

Monthly Labor Review. (2013). Percentage of the non-institutionalized civilian workforce employed by gender & age. Retrieved from http://www.bls.gov/cps/cps_aa2013.htm

Moravec, C. S. (2008). Biofeedback therapy in cardiovascular disease: rationale and research overview. Cleveland Clinic Journal of Medicine, 75, S35–S38.

Morita, Y., Iwamoto, I., Mizuma, W., Kuwahata, T., Matsuo, T., Yoshinaga, M., &Douchi, T. (2006). Precedence of the shift of body-fat distribution over the change in body composition after menopause. Journal of Obstetrics and Gynecology, 32, 513-516.

Morley, J. E., Baumgartner, R. N., Roubenoff, R., Mayer, J., & Nair, K. S. (2001). Sarcopenia. Journal of Laboratory and Clinical Medicine, 137(4), 231-243.

Moskowitz, R. J. (2014). Wrinkles. U. S. National Library of Medicine. Retrieved from https://www.nlm.nih.gov/medlineplus/ency/article/003252.htm

Nakamura, J., & Csikszentmihalyi, M. (2002). The concept of flow. In C. R. Snyder & S. J. Lopez (Eds.), Handbook of positive psychology (pp. 89-105). New York: Oxford University Press.

Nassir, F., Rector, S., Hammoud, G.M., & Ibdah, J.A. (2015). Pathogenesis and prevention of hepatic steatosis. Gastroenterology & Hepatology, 11(3), 167-175.

National Alliance for Caregiving. (2015). Caregiving in the U.S. 2015. Retrieved from http://www.caregiving.org/caregiving2015.

National Eye Institute. (2009). Facts about floaters. Department of Health and Human Services. Retrieved from https://nei.nih.gov/health/floaters/floaters

National Eye Institute. (2013). Facts about dry eye. Department of Health and Human Services. Retrieved from https://nei.nih.gov/health/dryeye/dryeye

National Eye Institute. (2015). Facts about diabetic eye disease. Retrieved from: https://nei.nih.gov/health/diabetic/retinopathy

National Eye Institute. (2016). Facts about presbyopia. Department of Health and Human Services. Retrieved from https://nei.nih.gov/health/errors/presbyopia

National Institutes of Health. (2007). Menopause: MedlinePlus Medical Encyclopedia. Retrieved from http://www.nlm.nih.gov/medlineplus/ency/article/000894.htm

National Institutes of Health. (2013). Gallstones. U.S. Department of Health and Human Services. Retrieved from http://www.niddk.nih.gov/health-information/health-topics/digestive-diseases/gallstones/Pages/facts.aspx

National Institutes of Health. (2014a). The A1C and diabetes. Retrieved from http://www.niddk.nih.gov/health- information/health-topics/diagnostic-tests/a1c-test-diabetes/Pages/index.aspx

National Institutes of Health (2014b). Age changes in the lungs. Retrieved from https://www.nlm.nih.gov/medlineplus/ency/article/004011.htm

National Institutes of Health (2014c). Sweet stuff: How sugars and sweeteners affect your health. Retrieved from https://newsinhealth.nih.gov/issue/oct2014/feature1

National Institutes of Health. (2014d). What is atherosclerosis? Retrieved from http://www.nhlbi.nih.gov/health/health- topics/topics/atherosclerosis

National Institutes of Health. (2015). Cancer. Retrieved from https://www.cancer.gov/about-cancer/understanding/what-is-cancer

National Institutes of Health. (2016a). Facts about diabetes. Retrieved from http://www.niddk.nih.gov/health-information/health- topics/Diabetes/diabetes-facts/Pages/default.aspx

National Institutes of Health (2016b). Handout on Health: Rheumatoid Arthritis. Retrieved from http://www.niams.nih.gov/health%5Finfo/rheumatic%5Fdisease/

National Institutes of Health. (2016c). Older drivers: How health affects driving. Retrieved from http://nihseniorhealth.gov/olderdrivers/howhealthaffectsdriving/01.html

National Sleep Foundation. (2015). 2015 Sleep in America™ poll finds pain a significant challenge when it comes to Americans’ sleep. National Sleep Foundation. Retrieved from https://sleepfoundation.org/media-center/press-release/2015-sleep- america-poll

National Sleep Foundation. (2016). Menopause and Insomnia. National Sleep Foundation. Retrieved from https://sleepfoundation.org/ask-the-expert/menopause-and-insomnia

Neidleman, M. T., Wambacq, I., Besing, J., Spitzer, J. B., & Koehnke, J. (2015). The Effect of Background Babble on Working Memory in Young and Middle-Aged Adults. Journal of the American Academy of Audiology, 26(3), 220-228. doi:10.3766/jaaa.26.3.3

Neugarten, B. L. (1968). The awareness of middle aging. In B. L. Neugarten (Ed.), Middle age and aging (pp. 93-98). Chicago: University of Chicago Press.

Neugarten, B. L., & Weinstein, K. K. (1964). The changing American grandparent. Journal of Marriage and the Family, 26, 199–204.

Newton, T., Buckley, A., Zurlage, M., Mitchell, C., Shaw, A., & Woodruff-Borden, J. (2008). Lack of a close confidant: Prevalence and correlates in a medically underserved primary care sample. Psychology, Health & Medicine, 13, 185– 192. doi:10.1080/ 13548500701405491

Nimrod, G., Kleiber, D. A., & Berdychevesky, L. (2012). Leisure in coping with depression. Journal of Leisure Research, 44(4), 414-449.

Norman, G. (2005). Research in clinical reasoning: Past history and current trends. Medical Education, 39, 418–427. doi:10.1111/j.1365-2929.2005.02127.x

North American Menopause Society. (2016). Menopause FAQs: Understanding the symptoms. Retrieved from Http://www.menopause.org/for-women/expert-answers-to-frequently-asked-questions-about-menopause/menopause- faqs-understanding-the-symptoms

Nwankwo T., Yoon S. S., Burt, V., & Gu, Q. (2013) Hypertension among adults in the US: National Health and Nutrition Examination Survey, 2011-2012. NCHS Data Brief, No. 133. Hyattsville, MD: National Center for Health Statistics, Centers for Disease Control and Prevention, US Dept of Health and Human Services.

Office of Disease Prevention and Health Promotion. (2008). The physical activity guidelines for Americans. Retrieved from http://health.gov/paguidelines/?_ga=1.177233189.1671103883.1467228401

Organisation for Economic Cooperation and Development. (2016). Average annual hours actually worked per worker. OECD Stat. Retrieved from http://stats.oecd.org/Index.aspx?DataSetCode=ANHRS

Palacios, S., Henderson V. W., & Siseles, N. (2010). Age of menopause and impact of climacteric symptoms by geographical region. Climacteric, 13(5), 419-428.

Parker, K. & Patten, E. (2013). The sandwich generation: Rising financial burdens for middle-aged Americans. Pew Research Center. Retrieved from http://www.pewsocialtrends.org/2013/01/30/the-sandwich-generation/

Patel, C., Marmot, M. G., & Terry, D. J. (1981). Controlled trial of biofeedback-aided behavioural methods in reducing mild hypertension. British Medical Journal (Clinical research ed.), 282, 2005–2008.

Pattison, K. (2015). Sleep deficit. Experience Life. Retrieved from https://experiencelife.com/article/sleep-deficit/

Payne, K. K. (2015). The remarriage rate: Geographic variation, 2013. National Center for Family & Marriage Research. Retrieved from http://bgsu.edu/ncfmr/resources/data/family-profiles/payne-remarriage-rate-fp-15-08.html

Peterson, B. E. & Duncan, L. E. (2007). Midlife women’s generativity and authoritarianism: Marriage, motherhood, and 10 years of aging. Psychology and Aging, 22(3), 411-419.

Peterson, B. E., Smirles, K. A., & Wentworth, P. A. (1997). Generativity and authoritarianism: Implications for personality, political involvement, and parenting. Journal of Personality and Social Psychology, 72, 1202-1216.

Pew Research Center. (2010). The return of the multi-generational family household. Retrieved from http://www.pewsocialtrends.org/2010/03/18/the-return-of-the-multi-generational-family-household/

Pew Research Center. (2010a). How the great recession has changed life in America. Retrieved from http://www.pewsocialtrends.org/2010/06/30/how-the-great-recession-has-changed-life-in-america/

Pew Research Center. (2010b). Section 5: Generations and the great recession. Retrieved from http://www.people- press.org/2011/11/03/section-5-generations-and-the-great-recession/

Pew Research Center. (2015). Caring for aging parents. Family support in graying societies. Retrieved from http://www.pewsocialtrends.org/2015/05/21/4-caring-for-aging-parents/

Pew Research Center. (2016). The Gender gap in religion around the world. Retrieved from http://www.pewforum.org/2016/03/22/the-gender-gap-in-religion-around-the-world/

Phillips, M. L. (2011). The mind at midlife. American Psychological Association. Retrieved from http://www.apa.org/monitor/2011/04/mind-midlife.aspx

Proctor, D. N., Balagopal, P., & Nair, K. S. (1998). Age-related sarcopenia in humans is associated with reduced synthetic rates of specific muscle proteins. Journal of Nutrition, 128(2 Suppl.), 351S-355S.

Project Time-Off (2016). The state of American vacation: How vacation became a casualty of our work culture. Retrieved from http://www.projecttimeoff.com/research/state-american-vacation-2016

Qian, X., Yarnal, C. M., Almeida, D. M. (2013). Does leisure time as a stress coping source increase affective complexity? Applying the Dynamic Model of Affect (DMA). Journal of Leisure Research, 45(3), 393-414.

Ray, R., Sanes, M., & Schmitt, J. (2013). No-vacation nation revisited. Center for Economic Policy Research. Retrieved from http://cepr.net/publications/reports/no-vacation-nation-2013

Ray, R., & Schmitt, J. (2007). No vacation nation USA – A comparison of leave and holiday in OECD countries. Retrieved from http://www.law.harvard.edu/programs/lwp/papers/No_Holidays.pdf

Research Network on Successful Midlife Development. (2007, February 7). Midlife Research – MIDMAC WebSite. Retrieved from http://midmac.med.harvard.edu/research.html

Riordan, C. M., & Griffeth, R. W. (1995). The opportunity for friendship in the workplace: An underexplored construct. Journal of Business and Psychology, 10, 141–154.

Rossi, A. S. (2004). The menopausal transition and aging process. In How healthy are we: A national study of health in midlife. (pp. 550-575). Chicago: University of Chicago Press.

Rubin, M., Scevak, J., Southgate, E., Macqueen, S., Williams, P., & Douglas, H. (2018). Older women, deeper learning, and greater satisfaction at university: Age and gender predict university students’ learning approach and degree satisfaction. Diversity in Higher Education, 11(1), 82-96.

Saad, L. (2014). The 40 hour work week is actually longer – by 7 hours. Gallop. Retrieved from http://www.gallup.com/poll/175286/hour-workweek-actually-longer-seven-hours.aspx

Salmon, P. (2001). Effects of physical exercise on anxiety, depression, and sensitivity to stress: A unifying theory. Clinical Psychology Review, 21(1), 33–61.

Salthouse, T. A. (2004). What and when of cognitive aging. Current Directions in Psychological Science, 13, 140–144. Sandgerg-Thoma, S. E., Synder, A. R., & Jang, B. J. (2015). Exiting and returning to the parental home for boomerang kids. Journal of Marriage and Family, 77, 806-818. doi:10.1111/jomf.12183

Sawatzky, R., Ratner, P. A., & Chiu, L. (2005). A meta-analysis of the relationship between spirituality and quality of life. Social Indicators Research, 72, 153-188.

Schaie, K. W. (2005). Developmental influences on adult intelligence the Seattle longitudinal study. Oxford: Oxford University Press.

Scheibe, S., Kunzmann, U. & Baltes, P. B. (2009). New territories of Positive Lifespan Development: Wisdom and Life Longings. In C. R. Snyder & S. J. Lopez (Eds.), Oxford handbook of Positive Psychology (2nd ed.). New York: Oxford University Press.

Schick, V., Herbenick, D., Reece, M., Sanders, S., A., Dodge, B., Middlestadt, S. E., & Fortenberry, J. D. (2010). Sexual behaviors, condom use, and sexual health of Americans over 50: Implications for sexual health promotion for older adults. Journal of Sexual Medicine, 7(Suppl. 5), 315-329.

Schuler, P., Vinci, D., Isosaari, R., Philipp, S., Todorovich, J., Roy, J., & Evans, R. (2008). Body-shape perceptions and body mass index of older African American and European American women. Journal of Cross-Cultural Gerontology, 23(3), 255-264.

Schulz, R., Newsom, J., Mittelmark, M., Burton, L., Hirsch, C., & Jackson, S. (1997). Health effects of caregiving: The caregiver health effects study. Annals of Behavioral Medicine, 19, 110-116.

Seccombe, K., & Warner, R. L. (2004). Marriages and families: Relationships in social context. Belmont, CA: Wadsworth/Thomson Learning.

Seltzer, M. M., Floyd, F., Song, J., Greenberg, J., & Hong, J. (2011). Midlife and aging parents of adults with intellectual and developmental disabilities: Impacts of lifelong parenting. American Association on Intellectual and Developmental Disability, 116, 479-499.

Selye, H. (1946). The general adaptation syndrome and the diseases of adaptation. Journal of Clinical Endocrinology, 6, 117– 230.

Shure, J., & Cahan, V. (1998, September 10). Launch an exercise program today, say Aging Institute, Senator John Glenn. National Institute on Aging. Retrieved from http://www.nia.nih.gov/NewsAndEvents/PressReleases/PR19980910Launch.htm

Slevin, K. F. (2010). “If I had lots of money…I’d have a body makeover”: Managing the aging body. Social Forces, 88(3), 1003-1020.

Sorensen, P., & Cooper, N. J. (2010). Reshaping the family man: A grounded theory study of the meaning of grandfatherhood. Journal of Men’s Studies, 18(2), 117-136. doi:10.3149/jms.1802.117

Spiegel, D., Kraemer, H., Bloom, J., & Gottheil, E. (1989). Effect of psychosocial treatment on survival of patients with metastatic breast cancer. The Lancet, 334, 888–891.

Stern, C., & Konno, R. (2009). Physical Leisure activities and their role in preventing dementia: A systematic review. International Journal of Evidence-Based Healthcare, 7, 270-282.

Stewart, S. D., Manning, W. D., & Smock, P. J. (2003). Union formation among men in the US: Does having prior children matter? Journal of Marriage and Family, 65, 90 – 104.

Su, D., Wu, X., Zhang, Y., Li, H., Zhang, J., & Zhou, L. (2012). Depression and social support between China’ rural and urban empty-nest elderly. Archives of Gerontology and Geriatrics, 55, 564–569.

Swierzewski, S. J. (2015). Erectile Dysfunction. Retrieved from http://www.healthcommunities.com/erectile- dysfunction/overview-of-impotence.shtml

Tangri, S., Thomas, V., & Mednick, M. (2003). Prediction of satisfaction among college-educated African American women. Journal of Adult Development, 10, 113-125.

Taylor, B. J., Matthews, K. A., Hasler, B. P., Roecklein, K. A., Kline, C. E., Buysse, D. J., Kravitz, H. M., Tiani, A. G., Harlow, S. D., & Hall, M. H. (2016). Bedtime variability and metabolic health in midlife women: the SWAN Sleep Study. SLEEP, 39(2), 457–465.

Taylor, S. E., Klein, L. C., Lewis, B. P., Gruenewald, T. L., Gurung, R. A., & Updegraff, J. A. (2000). Biobehavioral responses to stress in females: Tend-and-befriend, not fight-or-flight. Psychological Review, 107, 411–429.

Teachman, J. (2008). Complex life course patterns and the risk of divorce in second marriages. Journal of Marriage and Family, 70, 294 – 305.

Teuscher, U., & Teuscher, C. (2006). Reconsidering the double standard of aging: Effects of gender and sexual orientation on facial attractiveness ratings. Personality and Individual Differences, 42(4), 631-639.

Thurston, W. E, & Vissandjée, B. (2005). An ecological model for understanding culture as a determinant of women’s health. Critical Public Health, 15(3), 229-242.

Torti, F. M., Gwyther, L. P., Reed, S. D., Friedman, J. Y., & Schulman, K. A. (2004). A multinational review of recent trends and reports in dementia caregiver burden. Alzheimer Disease and Associated Disorders, 18(2), 99-109.

Tower, R. B., & Kasl, S. V. (1995). Depressive symptoms across older spouses and the moderating effect of marital closeness. Psychology and Aging, 10, 625– 638. doi:10.1037/0882-7974.10.4.625

Twisk, J. W., Snel, J., Kemper, H. C., & van Mechelen, W. (1999). Changes in daily hassles and life events and the relationship with coronary heart disease risk factors: A 2-year longitudinal study in 27–29-year-old males and females. Journal of Psychosomatic Research, 46, 229–240.

Uchida, Y., Nakashima, T., Ando, F., Niino, N., & Shimokata, H. (2003). Prevalence of self-perceived auditory problems and their relation to audiometric thresholds in a middle-aged to elderly population. Acta Oto-Laryngologica, 123(5), 618.

Umberson, D., Williams, K., Powers, D., Chen, M., & Campbell, A. (2005). As good as it gets? A life course perspective on marital quality. Social Forces, 81, 493-511.

United Health Foundation. (2016). New report finds significant health concerns loom for seniors in coming years. Retrieved from http://www.unitedhealthfoundation.org/News/Articles/Feeds/2016/052516AHRSeniorReport.aspx?r=3

U.S. Bureau of Labor Statistics (2016). American time use survey – 2015. Retrieved from http://www.bls.gov/news.release/pdf/atus.pdf

U.S. Department of Health and Human Services and U.S. Department of Agriculture. (2015) 2015–2020 Dietary Guidelines for Americans. 8th Edition. Retrieved from http://health.gov/dietaryguidelines/2015/guidelines/

U.S. Department of Labor (2016). Vacation Leave. Retrieved from https://www.dol.gov/general/topic/workhours/vacation_leave

U.S. Government Accountability Office. (2012). Unemployed older workers: Many experience challenges regaining employment and face reduced retirement security. Retrieved from http://www.gao.gov/products/GAO-12-445

Vaillant, G. E. (1977). Adaptation of life. Boston, MA: Little, Brown

Vaillant, G. E. (2008). Spiritual evolution: A scientific defense of faith. New York: Doubleday Broadway. Vaillant, G. E. (2012). Triumphs of experience. Cambridge, MA: Harvard University Press.

Waldrop, D., Weber, J., Herald, S., Pruett, J., Cooper, K., & Juozapavicius, K. (1999). Wisdom and life experience: How grandfathers mentor their grandchildren. Journal of Aging and Identity, 4 (1), 33-46.

Wang, W. & Parker, K. (2014) Record share of Americans have never married: As values, economics and gender patterns change. Retrieved from http://www.pewsocialtrends.org/2014/09/24/record-share-of-americans-have-never-married/

WebMD. (2016). Erectile Dysfunction: Testosterone Replacement Therapy. Retrieved from http://www.webmd.com/erectile- dysfunction/guide/testosterone-replacement-therapy?page=2#3

Willis, S. L., & Schaie, K. W. (1999). Intellectual functioning in midlife. In S. L. Willis & J. D. Reid (Eds.), Life in the Middle: Psychological and Social Development in Middle Age (pp. 233-247). San Diego: Academic.

Wong, Y. C., & Leung, J. (2012). Long-term care in China: Issues and prospects. Journal of Gerontological Social Work, 55, 570–586.

World Health Organization. (2018). Top 10 causes of death. Retrieved from https://www.who.int/gho/mortality_burden_disease/causes_death/top_10/en/

World Health Organization. (2019). Burn-out an “occupational phenomenon”: International Classification of Diseases. Retrieved from: https://www.who.int/mental_health/evidence/burn-out/en/

Wu, Z., Sun, L., Sun, Y., Zhang, X., Tao, F., & Cui, G. (2010). Correlation between loneliness and social relationship among empty nest elderly in Anhui rural area, China. Aging and Mental Health, 14, 108–112.

Yeager, C. A., Hyer, L. A., Hobbs, B., & Coyne, A. C., (2010). Alzheimer’s disease and vascular dementia: The complex relationship between diagnosis and caregiver burden. Issues in Mental Health Nursing, 31(6), 376-384.

Yick-Flanagan, A. (2013). Meanings of menopause: Cultural considerations. Retrieved from http://www.netce.com/coursecontent.php?courseid=976

Zuidema, S. U., de Jonghe, J. F., Verhey, F. R., & Koopman, R. T. (2009). Predictors of neuropsychiatric symptoms in nursing home patients: Influence of gender and dementia severity. International Journal of Geriatric Psychiatry, 24(10), 1079-1086.

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