We're a couple in our early 40s who live in San Francisco and have been on 7 cruises, 5 with Princess. Overall, we knew what we were getting into up front, we had a nice trip, and we'd do it again.
PROS
1) Flawless embarcation. We received an email a few days ahead of time telling us when to arrive. We followed the instructions, and we were in our stateroom 30 minutes later.