Early 50's couple here, booked this cruise about 3 months prior to departure in part due to interesting itineary (Nessebur, Varna, Constanta and Sinup) and positive feedback from friends who had sailed Seabourn in past.
We have sailed with SilverSea twice before and found them a bit too overly formal and without many dining options. The Odyssey was the perfect size, a large ship with several options to drink and eat but small enough to avoid the mob scenes of many of the other cruise lines.
For the most part our fellow passengers were well traveled, smart and polite - they were not looking to make new best friends and everyone kept to themselves.
We upgraded to the Owners Suite which was the best vacation dercision we ever made. The suite is huge with a half bath in foyer, large living room with bar, and a separate bedroom with ensuite bath. Best of all the wrap-around balcony in front of the ship was ridiculously huge and has spoiled us from ever being in a regular stateroom again.