Retirement is a life-course transition that reshapes daily routines, social engagement, and exposure to stressors that influence later-life health. However, little is known about how frailty, an integrative indicator of biological aging, changes around retirement or whether patterns differ by education. This study examined frailty trajectories among Korean adults using seven waves of the Korean Longitudinal Study of Ageing. Distributed fixed-effects models estimated within-person changes before and after retirement, with frailty measured with a 41-item index across physical, cognitive, and psychosocial domains. Frailty remained stable prior to retirement but increased significantly during the first 2 years afterward, with elevated levels persisting. Increases were larger and sustained among individuals with lower education, whereas higher-educated retirees experienced smaller and temporary changes. Findings suggest that retirement marks a pivotal period in the accumulation of health deficits and that education serves as a protective factor, highlighting the need for policies supporting equitable post-retirement resources.
AguilaE.López-OrtegaM.GutiérrezRobledoL. M. (2018). Non-contributory pension programs and frailty of older adults: Evidence from Mexico. PLOS ONE, 13(11), Article e0206792. https://doi.org/10.1371/journal.pone.0206792
2.
ArsenijevicJ.GrootW. (2022). Health promotion policies for elderly—Some comparisons across Germany, Italy, the Netherlands and Poland. Health Policy, 126(1), 69–73. https://doi.org/10.1016/j.healthpol.2020.01.013
3.
BaekW.MinA. (2022). Frailty index and gender‐specific mortality in Korean adults: Findings from the Korean longitudinal study of aging (2006–2018). Journal of Advanced Nursing, 78(8), 1–11. https://doi.org/10.1111/jan.15168
Börsch-SupanA.SchuthM. (2014). Early retirement, mental health, and social networks. In WiseD. A. (Ed.), Discoveries in the economics of aging (pp. 225–254). University of Chicago Press. https://doi.org/10.7208/chicago/9780226146126.003.0007
6.
CalvoE.SarkisianN.TamboriniC. R. (2013). Causal effects of retirement timing on subjective physical and emotional health. The Journals of Gerontology Series B: Psychological Sciences and Social Sciences, 68(1), 73–84. https://doi.org/10.1093/geronb/gbs097
ChengM. H.ChangS. F. (2017). Frailty as a risk factor for falls among community dwelling people: Evidence from a meta-analysis. Journal of Nursing Scholarship, 49(5), 529–536. https://doi.org/10.1111/jnu.12322
9.
DanneferD. (2003). Cumulative advantage/disadvantage and the life course: Cross-fertilizing age and social science theory. The Journals of Gerontology Series B: Psychological Sciences and Social Sciences, 58(6), S327–S337. https://doi.org/10.1093/geronb/58.6.S327
FanJ.YuC.GuoY.BianZ.SunZ.YangL.ChenY.DuH.LiZ.LeiY.SunD.ClarkeR.ChenJ.ChenZ.LvJ.LiL.China Kadoorie Biobank Collaborative Group. (2020). Frailty index and all-cause and cause-specific mortality in Chinese adults: A prospective cohort study. The Lancet Public Health, 5(12), e650–e660. https://doi.org/10.1016/S2468-2667(20)30113-4
13.
FriedL. P.TangenC. M.WalstonJ.NewmanA. B.HirschC.GottdienerJ.SeemanT.TracyR.KopW. J.BurkeG.McBurnieM. A. (2001). Frailty in older adults: Evidence for a phenotype. The Journals of Gerontology Series A: Biological Sciences and Medical Sciences, 56(3), M146–M157. https://doi.org/10.1093/gerona/56.3.M146
14.
GaleC. R.CooperC.Aihie SayerA. (2015). Prevalence of frailty and disability: Findings from the English longitudinal study of ageing. Age and Ageing, 44(1), 162–165. https://doi.org/10.1093/ageing/afu148
15.
HoogendijkE. O.AfilaloJ.EnsrudK. E.KowalP.OnderG.FriedL. P. (2019). Frailty: Implications for clinical practice and public health. The Lancet, 394(10206), 1365–1375. https://doi.org/10.1016/S0140-6736(19)31786-6
16.
HovenH.SiegristJ. (2013). Work characteristics, socioeconomic position and health: A systematic review of mediation and moderation effects in prospective studies. Occupational and Environmental Medicine, 70(9), 663–669. https://doi.org/10.1136/oemed-2012-101331
17.
IavicoliI.LesoV.CesariM. (2018). The contribution of occupational factors on frailty. Archives of Gerontology and Geriatrics, 75(June 2017), 51–58. https://doi.org/10.1016/j.archger.2017.11.010
18.
IrwinM.ArtinK. H.OxmanM. N. (1999). Screening for depression in the older adult. Archives of Internal Medicine, 159(15), 1701–1704. https://doi.org/10.1001/archinte.159.15.1701
19.
JangA. R.WonC. W.SagongH.BaeE.ParkH.YoonJ. Y. (2021). Social factors predicting improvement of frailty in community‐dwelling older adults: Korean frailty and aging cohort study. Geriatrics & Gerontology International, 21(6), 465–471. https://doi.org/10.1111/ggi.14160
20.
JokelaM.FerrieJ. E.GimenoD.ChandolaT.ShipleyM. J.HeadJ.VahteraJ.WesterlundH.MarmotM. G.KivimäkiM. (2010). From midlife to early old age: Health trajectories associated with retirement. Epidemiology, 21(3), 284–290. https://doi.org/10.1097/EDE.0b013e3181d61f53
21.
JunH. (2020). Social security and retirement in fast-aging middle-income countries: Evidence from Korea. The Journal of the Economics of Ageing, 17, Article 100284. https://doi.org/10.1016/J.JEOA.2020.100284
22.
KangJ. Y.ParkS.AhnS. (2022b). The effect of social pension on consumption among older adults in Korea. The Journal of the Economics of Ageing, 22, Article 100364. https://doi.org/10.1016/J.JEOA.2021.100364
23.
KangJ.ParkJ.ChoJ. (2022a). Inclusive aging in Korea: Eradicating senior poverty. International Journal of Environmental Research and Public Health, 19(4), Article 2121. https://doi.org/10.3390/ijerph19042121
24.
KimJ.HwangS. (2024). Separating the effects of transitions into and out of social isolation and loneliness on cognitive function in later life. The Journals of Gerontology: Series B, 79(7), 1996–2018. https://doi.org/10.1093/geronb/gbae082
25.
KimJ.KwonK. Y. (2024). Marital dissatisfaction and functional performance in older adults: Heterogeneity in the association by educational level. Social Science & Medicine, 340, Article 116460. https://doi.org/10.1016/j.socscimed.2023.116460
26.
KimJ.ParkS.KwonK. Y. (2025). Spousal loss and physical vulnerability: Diverging frailty trajectories by educational attainment in older adults. Social Science & Medicine, 382, Article 118408. https://doi.org/10.1016/j.socscimed.2025.118408
27.
KojimaG.TaniguchiY.IliffeS.JivrajS.WaltersK. (2019). Transitions between frailty states among community-dwelling older people: A systematic review and meta-analysis. Ageing Research Reviews, 50, 81–88. https://doi.org/10.1016/j.arr.2019.01.010
28.
KönigS.LindwallM.JohanssonB. (2019). Involuntary and delayed retirement as a possible health risk for lower educated retirees. Journal of Population Ageing, 12(4), 475–489. https://doi.org/10.1007/s12062-018-9234-6
29.
LiY.XueQ.OddenM. C.ChenX.WuC. (2020). Linking early life risk factors to frailty in old age: Evidence from the China health and retirement longitudinal study. Age and Ageing, 49(2), 1–10. https://doi.org/10.1093/ageing/afz160
30.
Mendes de LeonC.HenkensK.BültmannU. (2018). Work, retirement, and healthy aging: Life-course issues and challenges. Innovation in Aging, 2(suppl_1), 426–427. https://doi.org/10.1093/geroni/igy023.1597
31.
MirowskyJ.RossC. E. (2005). Education, cumulative advantage, and health. Ageing International, 30(1), 27–62. https://doi.org/10.1007/BF02681006
32.
MirowskyJ.RossC. E.ReynoldsJ. (2000). Links between social status and health status. In BirdC. E.ConradP.FremontA. M. (Eds.), Handbook of medical sociology (5th Edition, p. 4). Prentice Hall.
33.
NamN.KimJ. (2026). Diverging trajectories of depressive symptoms after retirement: The moderating role of social engagement. The Journals of Gerontology, Series B: Psychological Sciences and Social Sciences, 81(4), gbag010. https://doi.org/10.1093/geronb/gbag010
34.
ParkG. R.KimJ. (2023a). Trajectories of life satisfaction before and after homeownership: The role of housing affordability stress. Journal of Happiness Studies, 24(1), 397–408. https://doi.org/10.1007/s10902-022-00601-7
35.
ParkH.KimJ. (2023b). The use of assistive devices and social engagement among older adults: Heterogeneity by type of social engagement and gender. GeroScience, 46(1), 1385–1394. https://doi.org/10.1007/s11357-023-00910-6
36.
PearlinL. I.SchiemanS.FazioE. M.MeersmanS. C. (2005). Stress, health, and the life course: Some conceptual perspectives. Journal of Health and Social Behavior, 46(2), 205–219. https://doi.org/10.1177/002214650504600206
37.
Pérez-ZepedaM. U.GodinJ.ArmstrongJ. J.AndrewM. K.MitnitskiA.KirklandS.RockwoodK.TheouO. (2021). Frailty among middle-aged and older Canadians: Population norms for the frailty index using the Canadian longitudinal study on aging. Age and Ageing, 50(2), 447–456. https://doi.org/10.1093/ageing/afaa144
38.
PhelanJ. C.LinkB. G.TehranifarP. (2010). Social conditions as fundamental causes of health inequalities: Theory, evidence, and policy implications. Journal of Health and Social Behavior, 51(1_suppl), S28–S40. https://doi.org/10.1177/0022146510383498
39.
PinquartM.SchindlerI. (2009). Change of leisure satisfaction in the transition to retirement: A latent-class analysis. Leisure Sciences, 31(4), 311–329. https://doi.org/10.1080/01490400902988275
40.
RockwoodK.MitnitskiA. (2007). Frailty in relation to the accumulation of deficits. The Journals of Gerontology Series A: Biological Sciences and Medical Sciences, 62(7), 722–727. https://doi.org/10.1093/gerona/62.7.722
41.
RossC. E.MirowskyJ. (2010). Why education is the key to socioeconomic differentials in health. In BirdC. E.ConradP.FremontA. M.TimmermansS. (Eds.), Handbook of medical sociology (6th ed., p. 3). Vanderbilt University Press.
42.
Sims‐GouldJ.FrankeT.Lusina‐FurstS.McKayH. A. (2020). Community health promotion programs for older adults: What helps and hinders implementation. Health Science Reports, 3(1), Article e144. https://doi.org/10.1002/hsr2.144
43.
SongK.KimJ. (2024). Prolonged exposure to intimate partner violence and depressive symptoms among Korean married couples: The intersection of gender and education. Society and Mental Health, 14(2), 129–144. https://doi.org/10.1177/21568693231185853
44.
StenholmS.WesterlundH.HeadJ.HydeM.KawachiI.PenttiJ.KivimäkiM.VahteraJ. (2015). Comorbidity and functional trajectories from midlife to old age: The health and retirement study. The Journals of Gerontology Series A: Biological Sciences and Medical Sciences, 70(3), 332–338. https://doi.org/10.1093/gerona/glu113
45.
StenholmS.WesterlundH.SaloP.HydeM.PenttiJ.HeadJ.KivimäkiM.VahteraJ. (2014). Age-related trajectories of physical functioning in work and retirement: The role of sociodemographic factors, lifestyle and disease. Journal of Epidemiology and Community Health, 68(6), 503–509. https://doi.org/10.1136/jech-2013-203555
46.
SzinovaczM. E.DaveyA. (2005). Predictors of perceptions of involuntary retirement. The Gerontologist, 45(1), 36–47. https://doi.org/10.1093/geront/45.1.36
47.
Van Der HeideI.Van RijnR. M.RobroekS. J. W.BurdorfA.ProperK. I. (2013). Is retirement good for your health? A systematic review of longitudinal studies. BMC Public Health, 13(1), 1–11. https://doi.org/10.1186/1471-2458-13-1180
48.
VigezziG. P.BarbatiC.MaggioniE.StenholmS.OdoneA.AmerioA.ArditoC.BertuccioP.CostaG.d’ErricoA.GentileL.OdoneA.VigezziG. P. (2025). Impact of retirement transition on health, well-being and health behaviours: Critical insights from an overview of reviews. Social Science & Medicine, 375, Article 118049. https://doi.org/10.1016/j.socscimed.2025.118049
49.
WahrendorfM.DraganoN.SiegristJ. (2013). Social position, work stress, and retirement intentions: A study with older employees from 11 European countries. European Sociological Review, 29(4), 792–802. https://doi.org/10.1093/esr/jcs058
WilkieR. Z.ChoiE. Y.FarinaM. P.LeeJ.AilshireJ. A. (2024). Cross national patterns in educational inequalities in functional limitations among middle aged and older adults at two time points. SSM - Population Health, 28, Article 101725. https://doi.org/10.1016/j.ssmph.2024.101725
52.
WonC. W.YangK. Y.RhoY. G.KimS. Y.LeeE. J.YoonJ. L.ChoK. H.ShinH. C.ChoB. R.OhJ. R.YoonD. K.LeeH. S.LeeY. S. (2002). The development of Korean activities of daily Living (K-ADL) and Korean instrumental activities of daily Living (K-IADL) scale. Journal of the Korean Geriatrics Society, 6(2), 107–120.
53.
YangM.LeeJ.LynchM.WilkieR.van TongerenM.KangM.-Y. (2025). Educational and gender disparities in healthy working life expectancy among middle-aged and older adults in South Korea. Occupational and Environmental Medicine, 82(6), 293–299. https://doi.org/10.1136/oemed-2025-110239
54.
YooJ.-I.ChoiH.HaY.-C. (2017). Mean hand grip strength and cut-off value for sarcopenia in Korean adults using KNHANES VI. Journal of Korean Medical Science, 32(5), 868–872. https://doi.org/10.3346/jkms.2017.32.5.868
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