Well practically there are mor <13 then >13...
No way. There's 2 more >13 ppl in the world then <13, knowing that some of those don't have an account, and that a few of <13s only use twitter, I'd say that:
There's 68 >13 ppl in fb and 59 <13 ppl in facebook. Therefore there's more over 13 ppl in fb then the opposit!
That's called maths.