The population pyramid is a graphical representation of the age and gender composition of a specific population. The shape of the graph depends on the age and gender structure of the population. The representation may take the form of a pyramid, but it may have a columnar shape, with vertical sides rather than sloped sides, or it may have an irregular profile.

Population pyramids provide a summary view of the overall age-gender structure of a specific population. The size of the population is depicted on the horizontal axis, and age is aligned on the vertical axis. The depiction actually contains two graphs, in mirror image format, on either side of a central vertical axis; the female population is represented on the right side of the axis, ...

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