Stephen Breyer did step down (82) to allow Biden to get Jackson in, but there was concern he was going to RBG us.
And yes RBG was incredibly selfish. I was not amongst those celebrating her career at her death, as she did far more harm than good over all by her refusal to retire, even in light of continued serious illness at advanced age. Her 'wish' on her death dead that Trump not fill her seat, was empty and hollow, when at many times she had the power to do more than 'wish'.
It is clear, what tends to happen with all these 80+ year old SC and Politicians, is not different then what happens with seniors in their advanced years generally. They fear losing their routine, their circle of 'friends', and becoming somewhat forgotten.
That is a very common fear for aging people, and seems to explain why so many cling to their positions well beyond any rational point to do so. That is why they SHOULD impose upper age limits. If they can have age limits on the bottom end (minimum ages) then there is no logic that should deny they can have them at upper ages.