My first cruise was on the ecstacy in the summer. My family's planning to go again but during the school year - I'm worried there is not gonna be many teens on the boat? is there a big difference between the holidays and school year? I love to make friends so its kind of a big deal.
Are you going during a spring break week? There should be a good number, but not as many as during summer.
That is a ship that is bound to have some teens on almost any cruise although the number can vary quite a bit depending on the season.
But in the end it is not about the quantity of friends you make, it is the quality. We can only tell you there will be fewer but most likely at least some teens. I suggest you just put your expectations in a place where you think "no matter what, I will still have a good time."