A population pyramid plots each age cohort by sex. Its shape reveals a country's growth stage and dependency ratio. Pick a shape, or drag the slider to morph the base.
■ male ■ female — bar length = % of total population in that age group
Try: push the slider fully right (wide base) — the dependency ratio climbs because so many are young. Now pull it left: the base pinches, the top swells, and the ratio rises again — this time from a heavy elderly load.