population pyramid

A population pyramid is a visual tool that illustrates the age and sex distribution of a population, typically represented as two back-to-back histograms. This representation is crucial for demographers and planners who need to predict future demographic trends based on current age distributions. The design of the pyramid varies depending on the growth stage: a stage 1 pyramid shows high birth and death rates with a predominantly young population, while a stage 5 pyramid indicates an aging population with low birth rates.