The age pyramid - also known as the population pyramid - describes the population by age group. The size of age groups is presented by stacked horizontal bars where the bars for men are on the left side of the vertical axis and the bars for women on the right side. Age is given on the vertical axis so that the youngest age group is at the bottom (e.g. 0 to 4-year-olds) and the oldest age group (e.g. over 100-year-olds) is at the top.
The age pyramid can be made either by using numbers by age group, by calculating the relative proportion of each age group in total population, or by calculating the relative proportion separately from the sum of men and women.
Calculation of relative proportions makes it easier to compare several age pyramids with one another. This facilitates comparison of populations of different size.
The age pyramid is commonly calculated by five-year age group or one-year age group.
You can examine the age pyramids of different countries from the years 1991 to 1999 and according to the population projection for the years 2000 to 2050 at: www.census.gov/ipc/www/idbpyr.html
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