The age pyramids of
countries or underdeveloped countries
characteristics related to the
of such populations, with
wider base and narrow . The base
age range, much wider than the
levels, indicates a high rate. The
levels just the base may present
impressive reduction in poorer
due to infant mortality.
that represent the youth
also wide showing future on
job and habitation . The widths of
the diminish as age increases
the apex that represents elderly,
demonstrating difficult life ,
precarious health services and life
expectancy.