I made friends in my thirties by joining a local tabletop role-playing group. We meet a couple times a month, aside from gaming we also have cheerful conversations while having dinner to break the session that last about 8 hours. We take turn hosting, bringing and preparing the food. Some of them have kids but make arrangements. A few people have moved away and new ones joined over the years. Some came back to play with us over skype. They are now among my best friends.