I don't watch debates until we get to the real presidential race, but from the clips I have seen, Biden seems to be losing some of his acuity.
I think so, too. Trump has also experienced a loss of cognitive function.
I don't know if it would be Constitutional to subject the offices of POTUS and VP to an age limit, but since we have a minimum age restriction I don't why it wouldn't be. But that's an incredibly difficult thing to get passed -- especially since so many aging members of Congress hold -- or have held --Presidential ambitions.
One alternative might be for Electoral College electors to pledge/commit to not voting for candidates in excess of age 72 or a somewhat comparable age. I don't know why the country can agree that a President needs to be at least 35 years of age, but can't agree that old age has its own pitfalls.
It's actually rather unfortunate because there are plenty of older people that don't experience cognitive declines until much later in life. But, part of that cognitive decline often includes impaired judgment, and that frequently extends to judgment of one's own abilities and acumen. That means candidates in cognitive decline often don't realize it, or can't be convinced that their skills have deteriorated.
I think our country needs to have a frank discussion about this, and it shouldn't be a partisan issue. I'm sure one of the principal arguments against an age restriction would be that there are plenty of people 70+ that haven't experienced cognitive decline and would be blocked from running based off of age alone. But, isn't that what already happens to candidates younger than 35 who might otherwise be qualified or able to do the job?
Part of the reason for an age limit would be that even if a candidate isn't showing a cognitive decline before they're elected, the next 4-8 years presents ample opportunity for such a decline to begin.
Another alternative might be to establish a panel of non-partisan experts to voluntarily evaluate the cognitive and physical health of candidates. I tend to believe candidates like Biden and Trump wouldn't participate, but if other older candidates did it would pressure them to do so, and their refusal to be tested would be something voters could then consider.
I know as Americans we want our mental and physical health to be a private matter, but the President of the United States (and the VP) aren't really private citizens anymore. They're our highest ranking elected officials -- our leaders -- and they're responsible for our military, use of nuclear weapons, and a host of other incredibly serious and very impactful things.
Why shouldn't we demand a higher standard for them and have more confidence that they're fit and able to do the job? I think it undermines our democracy to have a POTUS or VP that might have a cognitive decline severe enough that their staff end up being the ones truly running the country.