Hi Ed.
I'm 62 now, and have travelled with JY for a while. I don't do long haul because of problems with my back and eyes, but have been to various places in Europe with JY. My first trip with them was to Cilento Coast, and I've been since on the following holidays, Istrian Coast (twice), Costa de la Luz, Highlights of Tuscany, Dubrovnik and the Dalmatian Riviera, French/Belgium Battlefields, Slovenia and Cilento Coast (again). :)
I am going on my first river cruise with them in November. Imperial Cities of the Danube. I am still deciding what to do next year.
JY is a very safe company to travel with, people are generally friendly, and you really can do your own thing if you want to.
If you want a quieter holiday I would certainly recommend the Escape Holidays where you are generally in one hotel, and go out places from there.