For me it was InuYasha and Negima!. InuYasha started it, and Negima! got me hooked. I first watched InuYasha when I was 6 (don't ask me why ok? long story), and then we got Funimation later on and I found a funny show called Negima!. Yeah. Serious answers only! If you don't like anime, don't comment.
I grew up with anime appearing on the kid's channels in the morning so I never really had to turn into a fan
When I was four, my favourite show was Sailor Moon. I even dressed up in a Sailor Moon costume for Halloween. I used to watch DBZ, and I was an Inuyasha fanatic. Sometimes I would watch Gundam Seed or Naruto when it came on tv.
when I was 10, I really began exploring anime, expanding into what the internet could offer, like Mermaid Melody and Wolf's Rain and Ginga Densetsu Weed