This is an old thread, but I'll add my thoughts anyway...
I attended skating & ballet lessons & even art classes with other adults. No one talked. They came for their classes & at the end just scattered. At work no obe talks either. It's a mystery to me on how to make new friends. It's basically hopeless.
You sure as hell won't make true friends at work. They'll stab you in the back with any personal information you divulge the first time it advances their interests to do so. So, that's out. I'm 53 later this week, and my wife/best friend died three years ago. My best male friend died in a car accident, and my closest remaining friend dropped me with no explanation. Yes, finding new friends now... hopeless. I've quit even trying. I tried plenty for a few years.but it's too late. Everyone makes their lifelong friends before their 30s, and they don't want any more after that. I can't really blame them. I probably wouldn't either if I had my other friends still... So, it just is what itis.but, I swear, other than my parents, I could literally move to Hong Kong and disappear... and no one would really notice, or care.