Eight years from now Donald Trump will not look remarkably any older than a comparable man of his age.
The normal strain of being President of the United States isn't going to affect him. Why? Because he's NOT going to be fixated and obsessed with fooling the people and satisfying those he's beholden to because of politics and favors. Trump is DOING what he said he would do, no more and no less. The past few presidents were so focused on their "legacies" that it took a huge toll on them physically. The worries, the frustrations, WAY more stress than anybody should have to endure. But they endured because it was more important to have their names in the history books than actually accomplishing anything substantially positive.
Trump has no need for that. He is acting like a man aloof from the nonsense of the past nearly three decades.
It really is an amazing thing to behold. And eight years from now, he's going to appear not much the worse for wear.
His wife will insist and contribute to his preservation....