I agree with the others - do it!
As for the Navigator of the Seas, it ain't that old! Still a nice ship to sail on, so I wouldn't worry about that.
Travel Agent/Cruise Specialist w/15 yrs exp and 50 Cruises on 12 different cruise lines in many parts of the world! VIETNAM VETERAN OWNED & OPERATED. Certified Accessible Travel Advocate. Specializing in unsurpassed personal service to insure you have a hassle-free vacation!