I hope I'm not repeating what has already been said, as I admit to having skimmed the messages quite quickly.
What about the U3A?
Yes - that's short for University of the 3rd Age, so its members are older, but it comprises groups with particular interests that meet regularly.
In my area we have about 40 groups , each set up by a member who is interested in a particular activity. They range from a Ukelele group, Scottish Country Dancing, several Book groups, languages from French to Latin, Astrology, Dog walking, Rambling, Scrabble , Mahjong, Bridge ,Science, Crafts, and a Lunch Club etc. Oh and we have a variety of day Coach trips available each year, visiting interesting places
As you can see, the range is very wide and there's no need to be put off by the word university. Anyone can set up a group about anything, as long as they can get others interested.
It's a national organisation so if you google it you should be able to find a branch near you and hopefully you might find a group or two that interest you. Shared interest makes age irrelevant!!