I'm 18, and I'm pretty sure my moustache and beard should be bigger by now. My friend, who has at least sideburns, told me you had to keep shaving it off for it to grow back more (IE Kramer with his chest hair in Seinfeld).
True? Because, I just shaved five minutes ago in hopes that it'll come back even more this time.
It seemed to work last time... If I tilt my head into the light I can see the illusion of a handlebar moustache.