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A population pyramid, also called "age pyramid", is a horizontal bar graph that illustrates the distribution of different age groups in a population, showing the number of males on the left and of females on the right.
For more details, see What is a population pyramid?
Watch how a population's age structure changes over time:
The shape of the pyramid for a particular province or territory relates to the rate of its population's growth or decline. See Types of animated population pyramids.
The age-sex distribution of a population is an important feature to analyse if you wish to understand the demographic situation of a country or region.
Vivian Z. Klaff sets out the following types of age structure models in Dem-Lab: Teaching Demography Through Computers, 1992 Prentice Hall:
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