Sure, Roger Penrose is a decade older, and he's probably the most intelligent living person

But a professor working out a few more tweaks to their life's work is not the peak of their career. And the mental abilities for that is not reacting to a million shitty things at once as the president of America.

It's kind of high stressed.

The standards are just that much lower for elderly teachers too, and if they're actually intelligent then they'd freely admit that their age is a negative.

That's just biology, there's no way around it. No one peaks at 70 years old...