What are the analyses provided by the study of human age pyramids?

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The study of human age pyramids can provide the following analysis:

Proportion of individuals in economically active age,

Proportion of elderly (indicating the quality of the pension and health systems), proportion of children and youth (indicates need for job generation and educational services), reproductive profile (shows the population growth tendency), and postnatal survival rate (indicates quality of the health system, hygiene conditions, nutrition, and poverty), longevity profile etc…

It is possible to suppose whether a population belongs to a rich and industrialized society or to a poor country since the patterns of the age pyramids differ according to these conditions.
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