Yeah, the stress of doing the job (and having long work hours) is aging - but Trump didn’t do the job, didn’t alter his work patterns (doing very little even when he wasn’t golfing), and didn’t care about the job outside of gratifying his own ego. Which probably meant it was actually refreshing for him.
Yeah, but the third of a string of failures, should he lose this next election. The demoralizing effects would have an impact on his ego. Easier to bathe in the adulation of the crowds at Mar-a-Lago.