Source: World Bank  

Release: World Development Indicators  

Units:  Percent of Total, Not Seasonally Adjusted

Frequency:  Annual

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.

Nations that are included in this data series are listed at http://data.worldbank.org/about/country-and-lending-groups. A developing nation is defined as one which falls within the lower or middle income bracket.

Source Indicator: SP.POP.65UP.TO.ZS