I don't remember exactly but I was like 14 years old. I watched anime very late, I didn't have friends who would recommend me anime and I didn't watch television either.
If I don't count anime like Pokmon, Naruto and Dragonball, which were on tv all the time, i would say i was about ten and the anime was bleach. It was the first anime to giveme interest in anime overall. I'm very thankful.