> Our entire society, hell our biology is based on old people retiring to leave space for the young to develop themselves

This strikes me as a spin on the lump-of-labor fallacy.

The problem with a gerontocracy is you have masses in cognitive and physical decline at the peaks of power. Absent that condition, the model isn’t fundamentally broken. (You would probably see more patricide in hereditary lines…) Old people aren’t a problem, aged people in command are.

That’s what makes the comparison to race interesting—a society that brain drains gets wealthier for everyone. If we made our immigration 65+ only, on the other hand, it would be an almost-immediate disaster.