I would attribute “what he’s done” to the company he keeps. But that has nothing to do with his mental condition. There are plenty of old people (70+) that are totally mentally fit. Biden clearly has mental issues, slurred words, saying shit that doesn’t make any sense, forgetting where he is, etc.

I’d say they’re both mentally compromised in different ways. Where Biden suffers from slow degradation brought on simple old age, Trump suffers from a legitimate mental illness.

We could always just vote for someone who doesn’t suffer from some sort of mentally illness, but that’s not allowed.