Population pyramid
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A population pyramid or "age-sex pyramid" is a graphical illustration of the distribution of a population by age groups and sex; it typically takes the shape of a pyramid when the population is growin
World population pyramid from 1950 to projected in 2100 (UN, World Population Prospects 2017)
Nearly half of Libya's 2011 population consisted of people younger than age 20.
Aging of the United States
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Since the 2010s, the fertility rate of the United States has declined below replacement level, prompting projections of an aging population and workforce, as is already happening elsewhere in the deve
The rate of population growth in the United States has been falling since the 1990s
Population aging accelerates industrial automation
An aging population has reduced the number of school-aged children in the United States
Unlike in the past, senior Americans in the twenty-first century generally expect to work after turning 65.