Age and the presidential pressure-cooker

Chuck Norris is worried about John McCain’s age:

Norris, an ardent supporter of Mike Huckabee, told reporters he believes serving as president accelerates the aging process 3-to-1.
“If John takes over the presidency at 72 and he ages 3-to-1, how old will he be in four years? Eighty-four years old — and can he handle that kind of pressure in that job?” Norris said, as Huckabee looked on.

Polimom’s Respected Mother mentioned something about this the other day also, and between the two of them they’ve made me curious. How old would everybody else be when/if they take office?
For the Democrats:

Hillary Clinton — 61
John Edwards — 55
Barack Obama — 47

For the Republicans:

Ron Paul — 73
John McCain — 72
Fred Thompson — 66
Rudy Guiliani — 64
Mitt Romney — 61
Mike Huckabee — 53

You’ll find birthdates and more candidates at this site — several of whom I’ve never heard of (good luck with that!).
But if Chuck Norris has a point about the incredible stress of the executive office, then I have a question about Mike Huckabee:

In 2003, at the age of 47, Arkansas Governor Mike Huckabee was diagnosed with type II diabetes. His physician warned him that he probably had—at most—another 10 years to live. Heeding that warning, Gov. Huckabee underwent a dramatic program of diet, exercise, and supplements, losing more than 100 pounds and completely eradicating his diabetes and related health risks. Now, transformed by this life-saving experience, Gov. Huckabee is aggressively working to change the health of Americans through targeted initiatives that emphasize prevention.

Good for him! Type II diabetes runs in Polimom’s family, and it’s radically affected both lifestyles and expected life spans for some of my nearest and dearest. I know what it can do, and I also know that it can be contained. Stress, though, can be an aggravator, and I wonder how Mike Huckabee would do in that very same pressure-cooker?