There's a saying that presidents age twice as fast while in office. Take a look back over the past 60 years of U.S. presidents and judge for yourself how much the office aged them.
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Gary Hershorn/Reuters
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.