Hi, I know you didn't direct this to me but to anwer your post, I belong to a small group, of 75 people who travels together, this is not the singles group. I know a few people who booked this cruise with a Travel Agent who books Singles. (You don't have to be single to book).
I believe that there will be many singles on this cruise but don't know the age group. And unless you know the TA and they tell you, then you won't know until your there.
Sorry that I can't help you more
Kate