Can only give you info about the age for driving jet ski at the beach in Phillipsburg. Age is 18, but younger age allowed to drive if someone older rides behind them. I did it, was great! Was first time for me and would do it again if the opportunity arises again. Just remembered the name of this beach........Great Bay Beach. They are also available at Orient Beach. Average price is 50-55 per 30 minutes, and 30 minutes goes by so quickly, but if you really want to give this a try, just DO IT...you will have a blast!
Rob