It's a non-starter. There are too many variables at play to force any demographic out. I agree that it'd be nice thought if those wealthy enough, or with other opportunities would step aside; Voluntary retirement was the first step of many airlines during COVID.
But that's the word, voluntary.
You can't judge someones financials on age. Divorce, or redundancy doesn't mean someone failed in their duties of financial planning to the extent of being labelled as having no integrity.
You can't assess who's "rich enough" either. Can't reward people with reckless spending and punish those with diligent savings.
Having said that:
I expect for rejoiners, there will be a 5 year bond in place. And that in itself will rule out anyone over 60, whether or not they are ready for it.