This will sound elitist, but it seems that all of us on this forum are in the same boat.
I'm basically astonished at how stupid some people my age, roughly, are (including me a lot of the time, probably). The fact that the average GCSE result in England is SEVEN Cs amazes me, and whilst that doesn't account for intelligence overall, it's a good indication, and coupled with the fact that these people aren't well spoken, and are generally, for lack of a better word, dumb, it paints a pretty bleak picture of teens.
BUT, there are obviously going to be exceptions, as that girl and Numbers prove, so (whilst I know you were only doing so ironically) you can't really criticise the whole age group. Although we do suck.