Easier said than done. Mental capability and age, after a certain point, can’t be separated. Good luck holding high level elected officials accountable by fairly testing cognitive function on a regular basis.
Who’s going to decide “what really counts?” Who’s going to draw out fair guidelines that won’t be vulnerable to political agendas? Who’s going to test officials and who/what organization will be paying them? Who’s going to enforce it? A person or group with the ability to oust a sitting president based on private medical information? That’s a lot of power to also be exploited for personal gain.
If you can’t answer these questions then it wouldn’t work. In an idea world I’d agree with you, but a blanket age cap is the most fair, realistic solution for everyone.
I support an age ceiling and floor, but the real reason we’re dealing with this reality is people are currently willing to vote for visibly senile people instead of voting for younger candidates. We wouldn’t even need an age cap if people realized voting for 80 year olds isn’t a good idea.
You gotta make it a point to ask what the pay range is in the first interview or you’re wasting your own time. If they won’t tell you, the job isn’t worth your time anyway.