Yup, and this is my age range.
I guess I should have specified, knowing the average age on HN is... just a little higher to say the least.
But to a progressively lower extent it applies to older generations as well.
you're highly unlikely to make friends once you're an adult and everyone's walls had gone up. most of those 4/5 just call their superficial acquaintances "friends". a real friend is essentially a platonic partner, and most people are lucky if they develop even one such friendship in their lifetime. I've lost one to distance and another to marriage, so even though I have "friends", I consider myself to be in the 1/5 too.