We're going on the sea and we're early 30's. We chose it because Princess seems more relaxed, more mature (although with this question, that might not be a good word choice). We were torn between Princess and Carnival and decided that we were too old for Carnival's party/good-time atmosphere. We both have very high stress jobs and families (no kids yet..extended family), and welcome the quiet time. Not that we won't be playing the pool games, etc.