You are cruising right in the middle of European schools vacation time, so the ship will be packed with kids, some of which are bound to be teens.
Apart from going to the teen clubs, there are lots of places teens 'hang' like the Flowrider, Ice skating, putt putt golf, Basketball court,so they may want to hang around there and make friends You can always go and see the Maitre D on the first day and ask to be seated at a large table with families with teens.