Nope:
[Y]et presidents do seem to age before our eyes. [S. Jay Olshansky, a professor at the University of Illinois at Chicago and a longevity expert] says that’s partly because we just notice it more in someone who lives in the public eye. In his JAMA article, Olshansky cited a study that connected gray hair to stress. But in his conversation with me, he emphasized that the outward signs of what we commonly attribute to aging and genuine aging aren’t necessarily related. "Getting wrinkles and turning gray—they really don’t matter very much," he said.
The Dish 