The results of this poll will depend heavily on the time of posting. We are getting a bit of an older skew right now, most probably due to the fact that people are posting this while at work (while the younger users are still at school).
I think if you ask this question at, say, 6pm, the mean age would be much lower.
"Its not the size of the dog in the fight, its the size of the fight in the dog." -Mark Twain