I was just talking to someone about this. A ton of people on here who are in their teens say they're in their 20's even though it's SO OBVIOUS that they're a teenager. Then it usually comes out in a comment or something that they're a teenager, and they always say they "clicked the wrong button" when they registered.
What's the point in lying about your age on a site I highly doubt ANYONE knows who you are... That's stupid xD this isn't zoosk. com where creepy men who are old as my grandpa try to get some nudes or a 14 thinking she grown going after some 28 year old.
I think that people lie about it more for protection. I mean I bet a lot of people put fake birthdays. People just don't want too much personal information on the web. That's why so many people use pronouns in their stories. He, She, Us, Crush, Friend etc