A Brief History Of The Presidency (1981-present)

Reagan - senile

Bush I - not senile

Clinton - not senile

Bush II - not senile

Obama - not senile

Trump - brain worms

Biden - senile

Trump II - brain worms and senile

You can debate the nuances of "senile" as applying to each one,* but it isn't a great record!

*I think it applies much less to Biden than the other two, even now, but you can't deny he has/had issues.