They are out there, but not a lot of them - particularly East Coast
US. You will be better off looking for weekenders your age there. Further afield, and away from the Eastern Carib, you will find more people your age. Of course, you will have to serve as the party boat for them!
I understand you - I turn 50 in a couple of weeks and am still almost always the youngest person in a cruiser's crowd! However, we seem to fit in better with the 30-40 crowd in regards to activities, interests, music
, etc. We just seem to be the "gap" cruiser generation, I guess.