I'm 18 now, so you're obviously going to hear me say screw the wee-uns. I had to go through the wait, they do too.
Of course, that's not true, otherwise I'd be a hypocrite. I was VERY mature when I was younger. In fact, the difference between when I was 15 and when I was 18 is nearly zero. I'm just slightly taller now and perhaps a bit more bitter. Still as idealistic as ever... but that's another story.
I agree with ya Fish. Instead of limiting it by age, they should limit by maturity... maybe have a "maturity test" or something, though I can see far too many problems with that.