for 4 members recording together after 60 years
Santana is an outside, but not unrealistic, possibility. They have 6 years to go, and there are five of them still alive out of six. Four of them worked together in 2016. The one who didn't was still working as of a few years ago, and was actually in the band longer than any of the others aside from Carlos Santana. On the other hand, three of them are percussionists, and drummers usually have more trouble playing into old age than guitarists and keyboard players.