Actually, we (Mustang Works) are working on a large demographic survey that we will have on the site soon. We'll be asking everyone to take it (and get entered into a site contest!) so that we can update our site audience demographic data. Age groups will be one of the questions.
Look for it soon, and I hope everyone will help us out by filling it out...
BTW: I'm 31 - god I'm getting old! ahahahaha