Correct, but that was by their own choice, Not by someone saying "look you just aren't capable any more so even if you don't want to go, you are going"
Do you realistically see RBG resigning while Trump is in office? I mean the addled old bird wouldn't even resign when Obama was in office and could have replaced her with a younger doppleganger of herself..
Good point about her not resigning for Obama either ----
Not so that resignation was by any of the 1800s-1900s problem justices' CHOICE --- that was the whole point of getting rid of them by (sometimes long) negotiation. After all, if they had chosen to resign --- they'd simply have resigned!! Like Anthony Kennedy did, last year, age 81. No, I read there were three or four Justices who had serious strokes or dementia and did NOT choose to go, much as you are suggesting about RBG. Though we don't know if that would happen --- it's too early yet, if she does have a chance of recovery. I think she's got another month before people start agitating. She might well resign if really incapacitated: we don't know. It would be graceful. Hey, she got a movie: she can't have live-forever too.