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Techniques Overall, 24,925 observations of 5865 individuals elderly 45-64 years were sampled through the seven waves of the Korean Longitudinal Study of Ageing (2006-2018). A dichotomous result variable had been derived on the basis of the Korean version of the Mini-Mental State Examination ratings, and occupations had been grouped into 12 categories, including three unpaid ones. Sociodemographics, lifestyle, and health conditions had been included as covariates withi