Hmm, since I found out about it around the time shows like Hellsing (13-ep) came out. That would be 2002. Maybe a year or two later, so 6-8 years. With being serious meaning that I follow the happenings, know about what gets released and watch some stuff from time to time. It's not like I have hundreds of series behind me.
I've always loved how different anime is to pretty much all the western media there was to see. Felt like a whole another world. Still feels that way.