My wife and I are in our late 50's from Victoria Australia. We have cruised with NCL Wind in Hawaii before and had no hesitation in booking another trip with NCL.
Embarkation was slow and annoying. Our latitudes membership didn't count. It took about an hour to get on board. Disembarkation was delayed by 90 minutes which resulted in our visit to the everglades being cut short. Not happy! Here is some advice for the land excursions. In Mexico don't bother booking any. You can either walk to the city center or safely take a taxi to see the sights. In Columbia at the cruise terminal you can hire a taxi and do a three hour tour of Cartagena without the hassles of getting in and out of coaches. We shared a taxi with another couple and cost about $30 per couple. In Costa Rica we booked the NCL tour to the Slouth Santurary; a great experience. In Key West just get a map and walk to the major attractions, including the bars.
On board the Pearl, we enjoyed the free style dining and both put on about 8lbs. Perhaps the several buckets of beer didn't help either.We went to most of the night shows and found them reasonably entertaining.