For younger writers (ages 12 and below), there is also Arrow Jr Magazine,
which "gives young children the opportunity to submit their creative works to appear alongside interactive content that is sure to get them excited about reading. We have a dedicated content contributor group of teachers, child fiction writers and comics illustrators. We accept poems, essays, short stories and drawings that go with them." All submissions should be sent to firstname.lastname@example.org. The next submission deadline is July 20th.