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Do presidents age faster than the rest of us?

Since the advent of television, we've been able to watch our presidents age almost by the day. Their faces grow wrinkled, and once-dark hair slowly turns gray.

President Obama had dark hair on his inauguration day. And now, nearly three years later he's a bit grayer.

Pictures: The Aging Presidents
President Obama aging thru first term
President Obama is noticeably grayer since first taking office. CBS

No doubt, stress can make a president look older. But does it also take years off his life? An answer came today in the Journal of the American Medical Association. Excluding the four presidents who were assassinated, most of America's chief executives have exceeded their life expectancy.

Of the 34 who died of natural causes, 23 lived -- on average -- 11 years longer than men of their era could expect.

Gerald Ford, who took office at age 61, lived a record 93 years and five months. John Adams, Ronald Reagan and Herbert Hoover also lived into their 90s.

Only 11 presidents failed to reach their life expectancy, including James K. Polk, who died of cholera, just three months after leaving office at age 53.

Why have presidents lived so long? Jay Olshansky, the author of the study, said for the most part, they've been better educated, wealthier and had better health care than the average American.

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