Well into their 90's for some of them, I'm sure.
With life expectancy ever-increasing (for those of us who aren't suicide/homicide bombers, at least) I imagine it could conceivably go even beyond that. Just because someone becomes old doesn't necessarily mean that they automatically become enlightened. There have been plenty of bitter old Commies who went to their graves having never seen the Socialist Miracle take root in America (thank goodness). ...I can just see it...a bunch of octogenarian Lefties hitting the singles bars looking for a quick fling with aging militant feminists.....such an ugly vision "sigh"