There's a saying that presidents age twice as fast while in office. If that's true, be sure to wish President Barack Obama a happy 54th birthday on Tuesday and then see how he and other presidents have aged while in office.
Then a candidate for a U.S. Senate seat in Illinois, Barack Obama is seen here speaking at the 2004 Democratic National Convention on July 27, 2004, in Boston. He was 42 years old at the time.
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