We asked at the desk if the tour was for 18 years and over and were told, no only the galley tour is adults only.
Our bridge tour was interesting...while we were there some alarm started going off! The tour guide said "Uh...that's not a very good sound." Everyone kind of laughed nervously as he went to investigate. Turned out there was smoke alarm going off in someone's room somewhere and they sent someone down to investigate (if an alarm goes off anywhere on the ship it also sounds on the bridge) I guess everything was fine because we heard no more about it.