We had the Dubai cruise booked for 18 months since our firt SS crise in April, 2006.
The kids that come to mind...one toddler that we didn't see often, two kids that were I'd say in the 4 to 6 range that were troublesome one or two times but only a brief few monents until their families reeled them in, the 14 year old delight, and a couple of other teens. There were a handful of 20-somethings either with their families or doing something for the ship to earn passage for specific functions.
I am 46 and was one of the youngest of the majority. Age made no difference whatsoever except for maybe the under 14 set.