No amount of healthcare can stop mental decline from old age. It happens to all of us eventually and it is very obviously something that has been happening to Joe Biden. I’m grateful for all he has done as President but it’s a good thing that he has decided to step down from running again.

But what was their life expectancy when Joe Biden was born 80 years ago?

Spent, as in past tense, because he has already outlived the life expectancy.