I'm 28, and a female. I got mistaken on forums for male (even after I changed my regular handle from "Gothbubbles" to "Cake-pie") more often than I get thought of as a kid.
In real life young 20-somethings think I'm their age. I'm like "Guys, I'm too old to date you" and they're all "You can't be much older..." when I tell them my age and he realizes through high school math that I'm a decade his senior I get cougar pick up lines. Males are strange creatures.
Online, I'm usually the right age. It's really hard to tell how old someone is out of context I think. I always thought most of the escapist's readers were closer to my age, and not closer to 18. There is a much smarter community here than in a lot of other forums.