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.
By contrast, 'minors' (which may be defined differently in different jurisdictions) are generally presumed incompetent to consent, but depending on their age and other factors may be required to provide Informed assent. In some jurisdictions (e.g. much of the U.S.), this is a strict standard.