Getting diagnosed isn't free, it can also be counterproductive if you can make-do without support. This is for several reasons, including discrimination. Not to mention it can be harder to diagnose an adult and even more so pointless as most support centers on autistic children (so I guess fuck us once we're adults/s). I was diagnosed at three years old. My father has never been diagnosed. We're a lot alike and now that my family knows #1 Autism is a thing, & #2 what at-least one Autistic person is like some of us believe that he is autistic too. There's not much point in him being diagnosed in spite of him hitting a lot of the same criteria I do because he is able to make-do without help. He very well may benefit if he had support but he doesn't and has managed to arrange his life to evade most of the things that give him difficulty.