Why the hell are you so focused on chronological age when there are people in their nineties still sharp? Trump does a rally for over an hour unscripted.I think he will somehow get forced out. The democrats blew it by not forcing him out a lot sooner......the signs have been there for a while. And they don't have anybody in the bullpen that is ready.
At this point Biden has no chance to beat anybody. Looking at how bad he is slipping......how can you possibly want him there for 5 more years. That's an argument that simply can't be made by a reasonable person. Biden might be in an elder care facility by then.
And the really sad thing is if Trump gets elected he will be older than Biden was when he was elected in 2020 - officially becoming the oldest president ever.
We have screwed ourselves big time.