Originally Posted by
ArcticBlade
What Viglante said... or just buy all the heirlooms and enchant them, then you'll semi-twinked until you hit 80+
I'm not sure as I'm not active atm, but I think there is a good number of twinks in the XP-off BGs at level 70. Many haven't upgraded from tBC, and some just think this was the most balanced PvP bracket in WoW's history. Might want to ask around your server to see how long the queues generally are.
But if you're not into that and just want to pwn people, just buy heirlooms and learn how to play your class (visit Arena Junkies, etc). Even most people with heirlooms seem to be very nooby when levelling.