As far as legitimate permissions go, I'm going to say no; however, every three blue moons, YWS holds an official contest, and, at times, those are split into age categories. So the answer is no with a very small exception of yes.
I am a forest fire and an ocean, and I will burn you just as much as I will drown everything you have inside.
-Shinji Moon
I am the property of Rydia, please return me to her ship.
I'll admit the two turtle doves are growing on me, but there are ten birds in this house already and we both know geese are feathered bioweapons of mass destruction. — Silvern