Rather than wait until tomorrow to post this, I thought I'd close out 2013 by acknowledging the tooniversaries pending in 2014.
50 years: Linus the Lionhearted, Magilla Gorilla, Underdog, Peter Potamus, Go Go Gophers, Famous Adventures of Mr. Magoo, Jonny Quest, Rudolph the Red-Nosed Reindeer.
45 years: Scooby-Doo, Where Are You?, Hot Wheels, Skyhawks, Cattanooga Cats, The Hardy Boys (Filmation), Perils of Penelope Pitstop, Dastardly & Muttley in Their Flying Machines, Frosty the Snowman.
40 years: Valley of the Dinosaurs, These Are The Days, Hong Kong Phooey, Wheelie & the Chopper Bunch, Devlin (the start of Hanna-Barbera's "rainbow logo" period). Also, the debuts of live-action shows such as Run, Joe, Run, Korg: 70,000 B. C., & Shazam!.
35 years: Spider-Woman, Casper & the Angels, The Super Globetrotters, Fred & Barney Meet The Thing, The New Shmoo, Plastic Man Super Comedy Adventure Show, and, lest we forget, the debuts of Scrappy-Doo and Hanna-Barbera's "swirling star" logo.
30 years: Kenner's Super Powers line prompts a change in the Super Friends franchise, as the series is given the sub-title, The Legendary Super Powers Show. After 12 seasons on CBS, Fat Albert moves into first-run syndication. Significant debuts include Pole Position.
25 years: Super Mario Brothers Super Show
20 years: Spider-Man (Fox series), Brothers Grunt.
15 years: Digimon: Digital Monsters, Spider-Man Unlimited, Avengers: United We Stand.
If there's anything I've missed, don't hesitate to let me know.