title: The aging of America. Challenges and opportunities.
mesh_terms: D000368:Aged; D002908:Chronic Disease; D003625:Data Collection; D006296:Health Services / Q000706:statistics & numerical data*; D006801:Humans; D008017:Life Expectancy; D006278:Medicare; D011158:Population Growth; D013223:Statistics as Topic; D014481:United States