Maybe. But many live longer:
[A] new study, published today in the Journal of the American Medical Association, finds that it’s not all bad for American leaders. By comparing presidents to other men of their eras, researchers discovered that commanders in chief die at about the same age as their peers. They certainly don’t age at double the speed [as was suggested by one physician]. Many live longer, probably because most have been wealthy, college-educated, and able to get good medical care. So why does being in office wrinkle presidents? Probably, the researchers say, because they’re just getting older like the rest of us.