A population pyramid is almost symmetrical and looks like a pyramid because:

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A population pyramid that is almost symmetrical and looks like a pyramid typically indicates that the age structure of a population is quite similar for males and females, with similar numbers of males and females at each age level. This symmetry does not directly relate to smoking habits, life expectancy changes, the working or retired status of individuals, or income levels, but rather to the balance between male and female population numbers.

A Population Pyramid Is Almost Symmetrical and Looks Like a Pyramid