I've worked with hundreds of girls in this age range, and I've seen a lot of deceptively young-looking ones. If you look at their eyes, and the set of their mouth, and listen to the pitch of their voices, you get a much clearer picture of their actual age. I'm a pretty good judge of this sort of thing, and I'm not at all convinced that these girls look underage. To me the girls look in their early 20's, and one of them claims to be 26.
We recently had a picture (
http://www.ticklingforum.com/attachment.php?attachmentid=42984 )that everyone was sure was a minor, a barefoot girl peeking out of the shower, and I could tell by her eyes that she wasn't. So I started scanning the picture for proof and finally I noticed that she was wearing a wedding ring.
My point is that it's easy to judge hastily, and some girls look a LOT younger than they are, and we don't want the TMF to become a place where you can't post pictures of cute, young-but-legal girls because they look "too young"