This detailed (sorry) review is for the Norwegian Spirit, sailing the Western Caribbean 2/20-2/27/2011.
We are a 37 year-old couple who booked the fabulous free cabin upgrade deal offered July/August 2010. We told several friends about the great deal, and they told friends, and we ended up as a group of twelve adults. With the exception of me and my husband the rest of the group is in the 50+ age range, however since we are childless we fit right in with the empty-nester crowd. ;-)
As a couple we have been on 5 cruises together. We have cruised two times on RCI's Adventure of the Seas (both oceanview), and then once each on Golden Princess (balcony), Carnival Glory (balcony), and now Norwegian Spirit (balcony). Before we married I sailed on Celebrity Horizon (oceanview - w/my mom and aunts on a week-long bachelorette party). I still consider us fairly novice cruisers compared to many on these boards, though in our limited experience we have tried most of the major lines for the US market.