35 years since I was 5. Although I went inactive for 10 years between the age of 17-27 when I became more interested in women than anime. So far anime has kept my interest far longer than women... Go figure.
Watched a little bit during the 90s, but have been watching a lot more since 2002. If you were to try and figure out how many hours I spent actually watching anime, my signature should have a rough estimate. I might have forgotten a few over the years though.