I've never been on a singles cruise before but am considering booking one for the end of the year. My friend and I are in our mid-20s and was wondering if there are cruises for our age group. I've been to a few sites so far and the pictures look like most everyone is in their 40s, which is fine by us if we feel included, I'm just not sure if we would really fit in. Are there cruises for 20-somethings? If not, would we fit in ok on a normal singles cruise?