Work ability of the aged under conditions of improving mortality.
D000368:Aged; D005260:Female; D006304:Health Status; D006801:Humans; D008297:Male; D008875:Middle Aged; D009017:Morbidity; D009026:Mortality; D012179:Retirement; D012737:Sex Factors; D014481:United States; D014937:Work; D014938:Work Capacity Evaluation