Even though it was from 1966, I think the youngest person in it was Mako.
I couldn’t find a single person from it who is still alive.
It’s on Disney+. It’s not great, but it was on a tape my parents used to put on for me so they could be undisturbed for an hour. I didn’t even like the film that much, but there were two Chip and Dale cartoons at the end, so I watched it to get to them.