And there are some wonderful, free online courses at FutureLearn.
Every subject you can think of.
I've taken Forensic Science, archaeology, psychology, About the Brain, Artificial Intelligence, Robotics, lots of history and much more. Course are quite short and you can dip in and out just when you have the time.
Have you tried NWR? Just a group of sociable people who meet in each other’s homes and discuss a wide range of topics. Alternatively what about a book group. I don’t like formal classes either but do like getting out with people.
I have tried most classes, keep fit, Pilates, yoga, stretch your mind & body , volunteering etc etc .... so I have now reached the stage where I know what I don’t want to do, but cannot think of anything that I do want to do but I do want to do something ,does anyone else feel the same? Should I be bothered or just accept that we all get a bit jaded ?