Twelve or thirteen. You have an eleven at the end of your username and you signed up a year and some months ago, so you could've been eleven when you signed up.
I used to spend a lot of time on here when I didn't have school, mostly in the mornings and night. If you're active, then it isn't difficult to get high rank. It just comes with the activity. It's not like I have much to do in the mornings and night.
Given that you just judged me when you know nothing about me makes me think that you are around eleven-thirteen. Also, using the term "barely a life" doesn't make me think that you are older.