Teens Really Do Like Twitter! [Visual Graph Stats - Trend Chart]
This chart shows comScore U.S. unique visitor stats for different age groups. A "100" score means that age group is represented among Twitter's user base in perfect proportion to how much that age group uses the Web as a whole.
In July, people ages 12-14 scored a "121" -- meaning they were represented among Twitter visitors 21% more than they were represented among total Web users. And that's up from the mid-70s -- significant underindexing -- on Twitter six months ago.
In summary, if comScore's stats are accurate, people between ages 12-24 are using Twitter, and a lot more are using it now than before.