Source: World Bank
Release: World Development Indicators
Population ages 65 and above as a percentage of the total population. Population is based on the de facto definition of population, which counts all residents regardless of legal status or citizenship--except for refugees not permanently settled in the country of asylum, who are generally considered part of the population of the country of origin.
World Bank Source: The United Nations Population Division's World Population Prospects.
Source Indicator: SP.POP.65UP.TO.ZS
World Bank, Population ages 65 and above for the United States [SPPOP65UPTOZSUSA], retrieved from FRED, Federal Reserve Bank of St. Louis; https://fred.stlouisfed.org/series/SPPOP65UPTOZSUSA, July 17, 2018.