lets analyse the avarege age of otf
11=1 12= 1 13=5 14=11 15=5 16=2 17=3 18=1 19=1 30=1
oh you choose avg like that, i just took the range of most ppl here and then took the middle of it. Like Eli said, most people are 10-18, so the average is 14.
You have people aged 11-30, so the average is somewhere in the 20.5.
So the average is 17.25, if I seperate 14 (the average of most people are aged) and 20.5 (the ages of people commented here)
11=2 12=1 13=6 14=12 15=5 16=2 17=3 18=2 19=1 30=1
average of this is 523/35 = 14.94 i believe