I'm going to reply differently than most because you've gotten a lot of good advice. We're booked on the Celebrity Summit next June with our 14 year old granddaughter. This trip is for her because we've been on a NCL Alaska cruise plus a 62 day Alaska RV tour. But our granddaughter wants to live in Alaska after she graduates from veterinarian school. So, not sure about your 14 year old, but ours isn't interested in a party ship for teens. She is interested in the educational seminars for each port because she loves history and science. That's why we booked with Celebrity when people ask. Also, we booked an aft cabin with a balcony so she can enjoy quiet time and see views port and starboard. Finally we booked the Gold Rush Cruisetour before boarding the Summit so she can experience Fairbanks, Denali and Anchorage.
