A PlayStation Network Identification, often abbreviated PSN ID, is the name representing yourself that you create while signing up for the PlayStation Network online service. It's similar to your computer's name that you see when you click on the Start button (if you have Windows) or an Xbox Live Gamertag.
You are considered minor until the age of 18. A teenager at the age of 13. If you are convicted of some wrong-doing, the courts can consider you as an adult as young as 15. theres a couple different approaches on this one. 18, and under 21.
A person may also be considered an adult if he or she is drafted or volunteers for military service. In most countries this age is 18, though a few countries set the age at 16 or 17. In different countries, cultures may also determine that someone is an adult before legal ages for adulthood apply.