1. He W, Goodkind D, Kowal P. An aging world: 2015 Washington, DC (WA): United States Census Bureau; 2016. pp 165,
2. Cho SN, Park SM. The Concept of Generation and the Social Change in Korea. Ewha J Soc Sci 2002;9:39-68; [in Korean].
3. Shim TYJ, Kim MS, Martin JN. Changing Korea: Understanding culture and communication New York (NY): Peter Lang; 2008. pp 211,
4. Lee G. A Study on Age Norms in Later Life in Korea. J Korean Gerontol Soc 2006;26(1):143-59.
5. Lee K, Lee H. The Effects of Social-Psychological Factors on Cognitive Aging: Effects of Age Stereotypes and Self-Referent Belief. J Korea Gerontol Soc 2016;36(3):751-63.
6. Park JH. Study on the Concept of Generation: Cohort Perspective. Korean J Soc 2003;37(3):1-23; [in Korean].
7. Atchley RC. Social forces and aging: an introduction to social gerontology, 9th ed Belmont (CA): Wadsworth; 2000. pp 574,
8. Heckhausen J. Developmental regulation in adulthood: Age-normative and sociostructural constraints as adaptive challenges Cambridge (UK): Cambridge University Press; 2006. pp 251,
9. Settersten RA, Mayer KU. The Measurement of Age, Age Structuring, and the Life Course. Annu Rev Sociol 1997;23:233-61.
10. Shin HG. Middle-aged Korean’s Ageism Affecting Factors Mediated by Intergroup Anxiety. J Korea Gerontol Soc 2012;32(2):359-76; [in Korean].
11. Chen YC, Wang Y, Cooper B, et al. A Research Note on Challenges of Cross-National Aging Research: An Example of Productive Activities Across Three Countries. Res Aging 2018;40(1):54-71.
12. Choi I, Kim Y, Suh K. The Psychosocial Factors Affecting Suicidal Ideation of the Elderly. Korean Assoc Health Med Sociol 2009;25:33-56; [in Korean].
13. Bae NR, Park CS. A Study on the Ecological Factors Affecting the Quality of Life among the Elderly People. J Korea Gerontol Soc 2009;29(2):761-79; [in Korean].
14. Bennett KM. Social engagement as a longitudinal predictor of objective and subjective health. European J Ageing 2005;2(1):48-55.
15. Yun D. Convergent Effects of Subjective Health Status on Life Satisfaction of the Elderly Women Living Alone -The Mediating Effects of Social Participation and Self-Esteem. J Digital Convergence 2017;15(9):345-54; [in Korean].
16. Cherry KE, Walker EJ, Brown JS, et al. Social Engagement and Health in Younger, Older, and Oldest-Old Adults in the Louisiana Healthy Aging Study. J Appl Gerontol 2013;32(1):51-75.
17. Mendes de Leon CF. Social engagement and successful aging. European J Ageing 2005;2(1):64-6.
18. Park JS, Oh YJ. Health Promotion Behavior, Perceived Health Status, Social Participation and Empowerment in Frail Elderly Receiving Home Visiting Services. J Korean Public Health Nurs 2017;31(2):244-56; [in Korean].
22. Grant BC. Should physical activity be on the healthy ageing agenda? Soc Policy J New Zealand 2008;33:163-77.
23. Dench S, Regan J. Learning in later life: Motivation and impact. Research Brief RR183 Brighton (UK): Department for Education and Employment; 2000. pp 1-4.
24. Boulton-Lewis G, Tam M. Active ageing, active learning: Issues and challenges Netherlands: Springer; 2012. pp 1-180.
25. Caro FG, Caspi E, Burr JA, et al. Global Activity Motivation and Activities of Older People. Act Adapt Aging 2009;33(3):191-208.
27. Ng SH, Cheung CK, Chong AM, et al. Aging well socially through engagement with life: Adapting Rowe and Kahn’s model of successful aging to Chinese cultural context. Int J Aging Hum Dev 2011;73(4):313-30.
28. Burks VK, Lund DA, Gregg CH, et al. Bereavement and remarriage for older adults. Death Stud 1988;12(1):51-60.
29. Solomou W, Richards M, Huppert FA, et al. Divorce, Current Marital Status and Well-Being in an Elderly Population. Int J Law Policy Fam 1998;12(3):323-44.
30. Seo BS, Kim HK. Study on the elderly remarriage. J Korean Home Manag Assoc 1997;15(2):127-40; [in Korean].
31. Newman S, Hatton-Yeo A. Intergenerational learning and the contributions of older people. Ageing Horizons 2008;8(10):31-9.