I'm not going to wait until September to compile this list. Our anniversary list will also include non-animated series that premiered around the same time frames.
55 years: Mighty Mouse Playhouse.
50 years: Top Cat, Adventures of Pinocchio, Tales of the Wizard of Oz, The Alvin Show.
45 years: Space Ghost & Dino Boy, Frankenstein Jr. & the Impossibles, Cool McCool, The Beagles, The Lone Ranger (1st animated series), King Kong, New Adventures of Superman, Space Kiddettes.
40 years: Archie's TV Funnies, Pebbles & Bamm-Bamm, Help! It's the Hair Bear Bunch, Jackson 5ive.
35 years: Clue Club, Jabberjaw, Dynomutt, Krofft Supershow.
30 years: New Adventures of Zorro (Filmation), Spider-Man & His Amazing Friends, Smurfs (American debut), Goldie Gold & Action Jack, Laverne & Shirley in the Army, Hero High, Space Stars.
25 years: Pee-Wee's Playhouse, The Real Ghostbusters.
20 years: Pro-Stars, Swamp Thing, Wishkid, Hammerman.
I'm sure I've missed a few, so let me know if/what I have, ok?