1991 here too. I'm 36. I'm still on pretty much all day, every day, in a very large (private) irc channel that all my friends hang out in; same group of about 15 people for the last decade or so.
Same here, although I was 11. 7 is damn impressive given access means back then (I SLIP'd my Slackware box into Rutgers Camden). My IRC story linking in Finland -- I sought out Purple Motion and Skaven on an IRC server in .fi in 94 to be a fanboy and tell them how much I loved their music. Little did I know they were only a few years older than me. I dreamt of convincing my parents I needed to go to Assembly.. :)
I've only been on IRC for 4 years and I can't imagine life without it. For me, it's become one of those constants I can rely on that's just always there wherever I go.
Similarly, I remember using (PJIRC? ParrotIRC? Something like that from ~2000) to get on trivia game channels when I was in elementary school. Then, years later when I was getting into programming, I found out that this thing I've been using all along is a great resource for connecting with like minded people! The internet has been a social playground to me for almost as long as I've been exposed to it.
I can't imagine the Internet without IRC.