Beetcha! I'm only 13 and 5/6 (birthday on december 31). As far as I know, I'm the 4th youngest Enworld member . . . that I've seen anyway. I know Corlon and Ivanhoe are younger (they're in my game group, both are a few monthes my junior), and I could swear I met someone else who was 12 or 13 . . .
But I prattle. I just wanted to say, this really isn't a chat room. We hear at Enworld like to use whole words (except for when we don't, but that's not the point) for most of our posts. We usually don't use things like ur, ne1, 4, 2, r, and stuff like that . . . but LOL, ROTFL, ROTFLMAO (and all permutations), BTW, DMG, PHB, PSiHB (etc.), IIRC, RttToEE, and stuff like that is all common.
Oh yeah, and we try to keep our .sigs down to like4 or 5 lines, or disable them when our post is shorter than our sig. Look below the text box when you write a reply, there's an option that sais: Show Signature with a checkable bubble beside it. If you uncheck the bubble, your .sig won't show.
Just a bit of ettiquite (or however the heck you spell it),
-Jeph