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Population composition is the description of a population according to characteristics such as age and sex. These data are often compared over time using population pyramids.
Young people under the age of 20 account for an ever decreasing proportion of the population; from 39% in 1971 to 24% in 2006. The size of the youth population is projected to decline to 18% by 2056.
The working-age population increased as the baby boomers entered the workforce, but will decrease again when they start to leave this population in 2011.
Seniors currently account for 14% of the population; by 2056, it is projected that their share of the population will rise to more than 27%.
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