15 .. hormones without much in the way of control.
(no really .. the physical controls aren't even built yet)
Hormones start being produced around year 13.
The controls aren't completely in place until 20.
It's a wonder we make it thru at all

Heck you dont even know how tall you will be yet.
(among other things)
Oh sure.. the roller-coaster ride can be fun,
..until someone gets their eye poked out!
Enjoy the ride.
Don't take it seriously!
-Frank aka GE
(just sayin, tm Pasha)