I don't see why people in the UK make such a big deal about turning 21... I mean, 18's a big step since you're legally an adult, and I'd see 20 as somewhat symbolic since you're no longer a teen. But 21...? Maybe it has something to do with how they're currently slowly turning into the 51st state. Anywhooo, come to think of it, the weird part of it all isn't necessarily the "turning 21" part, but more remembering the time where I was 4, or 5, in the states, and thought that I'd never turn 21, let alone make it to 12th grade (merely because it was "so far away"). In fact once I remember getting pissed off because some friend got transfered from class 2 to class 12, and I thought they were letting her skip all the grades (and thus, naturally, she wouldn't have to go to school. A child's mind is always so pragmatic). But yeah, 21 seemed miles away.
So what's it going to change? Well, I'm sure it means I can run for some crazy office in some countries, and of course, I can drink in the US (errrr... yay?), but other than that it's just one more birthday.