Trends in the health of the elderly population.
D000368:Aged; D000369:Aged, 80 and over; D006262:Health; D006304:Health Status; D006306:Health Surveys; D006798:Housing; D006801:Humans; D007326:Institutionalization; D009017:Morbidity; D009026:Mortality; D011157:Population Dynamics; D012737:Sex Factors; D014481:United States