Ross Perot made the mistake of being born too early and having to run against two fairly popular candidates. If he were alive now, he could probably beat these two! Come to think of it, I don’t think there is anything in the Constitution that requires the candidate to be alive.
Speaking of not being alive … I don’t remember how to do actuarial calculations, but I wonder about the odds that both Biden and Trump will be alive in November, 2024. They are both elderly. Biden looks more feeble every day, and Trump is obese. That would be an interesting prop bet for those online gambling sites.