Pretty much the majority of shows I love ARE older ones, lol. I can't possibly name them all so, just to name a couple:
Star Trek
Monty Python
Welcome Back, Kotter
Rocky and Bullwinkle
Anything Muppets (duh hehe)
Thundercats
Normally I would hesitate to include anything from the '90s. It's just too soon. However I feel the early '90s is now pretty far off and actually closer to the '80s as far as atmosphere and style. So I'll include
Disney's Adventures in Wonderland. Very funny and educational; I learned the word "oxymoron" because of this show.