Health of the elderly.
D000208:Acute Disease / Q000453:epidemiology; D000328:Adult; D000367:Age Factors; D000368:Aged; D002908:Chronic Disease / Q000453:epidemiology; D005260:Female; D006262:Health; D006304:Health Status; D006801:Humans; D008297:Male; D008875:Middle Aged; D009017:Morbidity; D014481:United States