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.
President Bill Clinton is seen here addressing the troops during an Armed Forces Review and Awards Ceremony at Fort Myer, Virginia, on Jan. 5, 2001, just 15 days before leaving office. He was 54 years old at the time.
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