How US presidents have aged during their time in office

With so many hours spent in the Oval Office, it's no surprise that presidents have been known to put on a few (or many) wrinkles during their time in the White House.

While some leaders have aged gracefully ... others have not -- and for good reason!

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Barack Obama's transformation will make your jaw drop and the same goes for Ronald Reagan. And we gotta say, Jimmy Carter fared well in the aging department.

Take a look at the slideshow above to see how U.S. presidents have aged during their time in office.

RELATED: Presidents in their younger days:

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