In 1950 U.S. residents under 20 made up 33.9 percent of the population, while those 65 and older consisted of 8.1 percent of the population, says a report by the Congressional Research Service. But those numbers have changed over the years and are projected to keep changing. The share of people under 20 increased to 35 percent of the population in 1975, but dropped to 28.6 percent in 2000 and is expected to drop to 26.4 percent in 2025 and 25.7 percent in 2050. Meanwhile, the share of people 65 and older rose to 12.4 percent in 2000 and is expected to increase to 17.9 percent in 2025 and 20.2 percent in 2050.
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