I've got a very fuzzy sense (or lack of) of how long since whatever, but that "Date registered" is probably a good indicator -- I probably joined here right after getting avast, for support purposes. Late Nov. 2003, in my case.
Actually, now that I think about it, I'm pretty sure I'd been using avast long before that, on my previous system. Does "Avast 95" ring a bell with any old-timers? I think the forums here didn't even exist yet, or maybe I just hadn't yet discovered the marvels of online support.