16

The number 16 appears frequently in the mythology of Young Justice, as follows:


 * The reality designation of the Young Justice series is Earth-16, part of the DC Multiverse.
 * Superboy is 16 weeks old as of his first appearance in "Independence Day Part 1", and biologically 16 years old.
 * Miss Martian is 48 years old, the Martian equivalent of a human 16-year-old girl.
 * There are 16 members of the Justice League as of "Independence Day Part 1".
 * Red Tornado, the caretaker of the Young Justice team, has a Justice League designation number of 16.