I think I've figured out how people don't make friends though. They find identity reasons not to. "I have values and responsibilities. I cannot do this thing." Or "I am an X. I cannot hang out with these people."
Genuinely I'm quite happy with my friends. We hang out absolutely sober now and run 10ks and half marathons together. We have each other's location shared and meet many times a week and occasionally randomly text to see if we want to hang out.
I made the majority of these friends after the age of 30 and everyone told me you can't have this spontaneity at this age. Turns out you can. You just need to find the other people.