Being President of the USA is stressful. VERY... STRESSFUL. More than you and I could imagine.
With all of that stress comes intensified aging, and all presidents have aged pretty dramatically over their terms. I mean really who cares about this aging, we gotta be thankful for the work, but it sure is interesting. Check out some videos showing the aging affects of the office below, and an artists rendition of what Donald may end up looking like!