Being incredibly sharp isn’t enough for the most demanding job in the US government. We are talking international diplomatic trips with jet lag, situation room in the middle of the night military operations, basically being on-call 24/7 for any major event.
Joe Biden would have been 86 upon his last year in office if he won the election this year. That’s barely 4 years before my grandmother decided she couldn’t clean her own house and cook for herself anymore and moved to an independent living facility. That’s someone who had no other job besides cooking and cleaning for herself. And she’s a member of the gender that lives longer. And she’s one of the older people in the independent living community! She’s lucky to not have transitioned to assisted living.
The odds of dying as an 81 year old in any given year are 1 in 15. If you’re older than 85 your odds are 1 in 7.
An 81 year old president is someone who has basically a coin flip probability of dying before the end of their term.
This is just tech people being tech people, as always.