Well, I don't really know you much, and haven't seen you around here before. So far, you haven't really settled yourself down quite yet.
Going off of your username, your avatar, and some of your posts, I'd say something around 13-19 could legitimately work, but I thought of it to be in the lower end. I'd see it to be less likely to be anywhere around 15, but the lower and higher ends of that range are more probable.
Despite as blindly narcissistic as they act, which I'd imagine to be more indicative of someone who's younger, perhaps 13, they're more likely to be around 19.