I think Biden should step down, but what I am also getting at is Republicans complaining about cognitive testing and age when they don't believe in it when it applies to them. It's very easy for me to see. When highfigh says he's okay with a 100 year old who is sharp as a tack, what he's saying is he's okay with it when it benefits him (ie Republican). Note the lack of 'I think there should be age limits' and/or mandatory cognitive testing. Like having the spine to say it and having it apply to all. It's ridiculous.
Then I think we should have an amendment to the Constitution, but like you said, I don't see that happening anytime soon.
Heck, I'll even name it the Biden/Feinstein Law lol.