The later in May you travel the more kids will be on board. If you are traveling with your own they will think it is great. Lot's of kids is not a deal breaker but if this a concern for you then I would cruise earlier.
All I ask is a tall ship and a star to steer her by; John Masefield
Carnival: Glory 2004, Destiny 2008, Splendor 2009, Freedom 2011, Valor 2012, Dream 2013
Celebrity: Summit 2011
Princess: Ruby 2010, 2014, Caribbean 2013, Coral 2014, Regal 2014
Star Clippers: Royal Clipper 2015