The 111th Congress, which convened in 2009, is among the oldest in U.S. history. The average age of members of Congress has risen steadily since 1981, with just a slight hiccup in the early 1990s; the rise is likely the result of a high incumbency rate, the aging of the U.S. population, and the first-time elections of older candidates. Roll over the charts below to learn more.via online.wsj.com
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