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3. Aging

U.S. Centers for Disease Control and Prevention
The estimated population median age in 2009 was 36.8, up from 35.3 in 2000--a natural consequence of 77 million baby boomers pulling that figure upward with every passing year. The birth rate has also been relatively flat since the 1970s, and in 2009 posted the largest two-year drop in over... Phil Velasquez, Chicago Tribune
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