The current state of the Trumps' marriage is most likely due to a lot of factors. Donald's age is probably part of it, him being a frightful-looking orange goblin is probably part of it, the fact that there was almost certainly no real love between them to begin with is probably part of it, etc. Neither of the two extremes ("Trump is a cuck and can't get laid, sad!" vs. "Trump gets sex whenever he wants, however he wants!") feel right to me.