title: The challenges of an aging population.
authors: J B
authors: JB
authors: Weil
mesh_terms: D000368:Aged; D006301:Health Services Needs and Demand / Q000191:economics / Q000639:trends*; D006302:Health Services Research / Q000639:trends*; D006299:Health Services for the Aged / Q000600:supply & distribution*; D006801:Humans; D014481:United States