Kid: Scooby Doo for sure
Early-mid teens: Kinda stopped watching TV, I would watch NCIS and stuff when it was on, but never really went out of my way to watch anything.
Late teens: Really liked (still do, it's one of my favorites) Naruto
Now (I'm 20): I have a lot of shows I really like, but my current favorite would be Knights of Sidonia & The Walking Dead