Welcom to CLF,,
I would have to recomend Carvival for a couple reasons.
1. The time of year you are going,, less kids.. There will be some,, but they will most likelly keep to their groups..
2. The price.. It is cheaper and they do tend to market to the younger crowd.
3. The single women. They (again, in MHO) tend to travel in groups and Carnival seems to be the line of choice
4. The younger crowed. Even if your not there to look for the female. The age of the average cruiser seems to be younger on carnival.
Now,, Your milage may vary, check with your local dealer..
But as to every oppinion,, you know the saying,, everyone has one and some stink more than others.. LOL
I am sure that there will be kids, married couples and older people onboard..
But by and large, the majority I have seen seem to be the younger crowd..
Have a great trip.. Enjoy yourself... 
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