First ever episode of Anime I saw was a Teknoman episode, back when it was the ONLY anime released in Australia, aired at a decent time for the primary-schooler that was me.

So I suppose i fall into the 'been watching it for as long as I can remember' crowd, though I only started watching Fansubs when my friend gave me the beginning of the Trigun series on CD (quite a few years ago), and since then I've been into anything I can get my hands on.

Wait, that doesn't even answer the question... I don't really know - I think 6 years, maybe a bit more?