Well, I personally am not single, but I sailed the Ecstasy with a bunch of single women a while ago...we're in our early 30's. We saw tons of other singles too. I agree that the time of year will definitely matter. Or, you could try a cruise of a longer duration. Usually people have the opposite gripe about Carnival...that there is too much partying. I definitely don't think you'll find what you're looking for on Celebrity and although you have a decent chance of finding singles on a RCI ship, I think you should give Carnival another try.