I didn't catch this till someone brought this to my attention, but the show has a habit of making a significance to the number 16.
Examples: (more can be found on the YJ Wiki)
- Young Justice is set in the universe Earth-16
- Most of the kids are 16
- The Justice League were initially a team of 16 members (it is now at least 26, Zatanna and Rocket are 25 and 26 respectively)
- Red Tornado the main mentor to the kids is Justice League member 16
- The Justice League went missing for 16 hours
- The current year in Young Justice Invasion is 2016
- Many of the timestamps includes the number 16
What could it possibly mean? I don't think its a coincidence, there has to be a meaning to 16.