A population pyramid, also called an age pyramid or age picture diagram, is a graphical illustration that shows the distribution of various age groups in a population (typically that of a country or region of the world), which forms the shape of a pyramid when the population is growing. It is also used in ecology to determine the overall age distribution of a population; an indication of the reproductive capabilities and likelihood of the continuation of a species. (from Wikipedia)A clearer view of age of pyramid for the USA
The images below come from PopulationPyramids.net; visit the site to view pyramids from other countries.
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