You're right--most people meet friends through work and school. So I don't know what to tell you except that this website is a good place to talk with people who can relate to each other. When I first joined, I was very lonely, but having a place to go--even if online--helped a lot. It made me feel more connected to someting out in the world.
My SA is bad enough that I can't work, so I don't have the workplace, but back when I could
work in my early 20s, I made a lot of friends there. Even with the "old" people.
There was a man I became very good friends with who was 30 yrs older than me. But yeah, that doesn't happen every day; it's not a typical experience.