I just got off the phone with a Celebrity customer service rep who confirmed that Celebrity has planned four "adult only" cruises, i.e., the minimum age to book is 21. Seems as though they're testing the waters to see if there's a market, and while I feel parents have every right to vacation with their kids (and vice-versa!) it's also great to have a choice about whether or not to cruise with kids and teens.
Sail dates are 9/23 on Millennium, 11 days, 10/25 on Mercury, 7 days, 11/17 on Horizon, 7 days, all Caribbean, and 11/28 on Infinity, 10 days, Honolulu to Ensenada.
Isn't it nice to have choices?