Thank you so much you guys for answering! O actually thought of another question!
I believe I saw a rule about characters have to be 16+, which would put the minimum age around junior/senior in high school. I assume that that is in place for in case of mature themes.
But my question is, if I wanted to have a main character be freshman/sophomore age (so 13-15), but there wouldn’t be mature themes, would that okay, or is the 16 and older rule a hard rule?