I'm not defending any liberal democracy here. Any system where the people in charge of advancement are the ones with a shot at that advancement, there'll be conflicts of interest like this. If a constitutional amendment barring old people from something went in front of a room full of old people who happen to be potentials, that thing's getting shot down faster than a bolt of lightning.

I will only argue in the hypothetical, that there's no test for youthful inexperience, but cognitive decline can be tested. Although that fact is also quite meaningless in a system where the doctor applying the test can be bought off.

My point is actually capitalism bad, a socialist country will figure this stuff out one way or another.