Concept
Version 11
Created by Boundless
Global Aging
Source
Boundless vets and curates high-quality, openly licensed content from around the Internet. This particular resource used the following sources:
"Percentage of the World Population Over 65 - 1950-2050."
http://commons.wikimedia.org/wiki/File:Percentage_of_the_World_Population_Over_65_-_1950-2050.png
Wikimedia
CC BY 3.0.