Living longer in the United States: demographic changes and health needs of the elderly.
D000368:Aged; D005102:Health Expenditures / Q000639:trends; D006301:Health Services Needs and Demand / Q000639:trends*; D006302:Health Services Research / Q000639:trends*; D006299:Health Services for the Aged / Q000706:statistics & numerical data* / Q000639:trends; D006304:Health Status; D006801:Humans; D008962:Models, Theoretical; D009026:Mortality; D011157:Population Dynamics; D014481:United States