We expect people to use good sense. If in doubt, drop a line to a moderator. I doubt that a lot of 13 year olds are reading this, but you want to use reasonable judgment.
On a separate note (and definitely not wearing my Admin hat here as I state my opinion!), as a competitor very little pisses me off more than people dropping out of Ceramic DM without posting something, even if they don't have their story finished. Lord, that makes me mad, and I wish people wouldn't do it. It's disrespectful to the judges, and it's disrespectful to the other competitors.
Pant, pant. Okay, done now. I just needed to blow off steam. :\