When I was a kid, in the mid-70s, Saturday morning cartoons were pretty much the highlight of the week. I got to sit in front of the television from 7 a.m. to 11 a.m. (which is about the time that Soul Train came on, which drove me outside) and watch all kinds of cartoons and kid shows.
For some reason, one of my favorites was Big John, Little John, which (understandably) lasted only one season. The entire premise was that this 40-year old guy had drank from the Fountain of Youth and had to spend the rest of his life changing unexpectedly to a 12-year old (and, also unexpectedly, back again to 40). One can imagine the hilarious hijinx that could ensue from such a situation. Or not.
Anyway, here's the opening and closing theme. Try not to get too dazzled by the special effects. Apparently shifting ages involves a lot of blinking.
