My son, my neighbor's nephew, and possibly my aunt--I have suspicions though I haven't actually talked to her about it. She's in her mid-70s; I'm not sure that mentioning this would be a positive for her at this point. It's weird.
My neighbor's nephew is intellectually disabled as well--verbal, somewhat, mostly echolalia though he will answer some questions. He's in his 40s, but he considers himself a kid, which may be best since his safety depends on following other people's rules.
My son and I were talking about this earlier today. We relate to one another differently than we relate to most other people. We have a shorthand way of speaking that doesn't necessarily rely on meaningless phrases that people say just for the sake of politeness. If we're waiting in a store, we're both in almost constant motion--he paces while I tend to bounce, rock back and forth on my feet, or turn back and forth sideways (I like the way it bounces my purse off my hip). Most NTs are more still. So what I mentioned to him was this: Since we are mostly unaccustomed to seeing autistic behavior, and in fact, autistic behavior is heavily discouraged what with ABA being the "preferred" autism therapy, if we ran into other autistic people in the world, would we connect with each other, or would we tend to view one another as weird as per our own training in what's socially acceptable?