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.
My mom liked that movie a lot. I also ran across it on Disney+ a while back and watched it with my kids. I watched a lot of those 60s and 70s Disney movies as a kid in the 80s.. Herbie, etc.