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I don't think a magic number is the right solution here.

I do. There’s an age minimum for presidents

Presidents should be held to similar health and psychological requirements as astronauts. The role/responsibilities require the same level of performance.

Clearly there is a preferred age group amongst the electorate, so the open market solved this problem

Some say and I agree that he should have gone all the way in, and resigned

The President has no role to play in the Constitutional amendment process.

Biden could use his time to promote one, but there is absolutely no way it can be done in six months. A Constitutional amendment is an enormous hurdle to overcome -- three-quarters of the state legislatures.