I am amazed that it took me this long to discover this thread, and here I am 55 days away from my 79th birthday.
After reading through everyone's comments, I think I may be a bit of an oddity. My autism has been less of a problem as I have aged. My teens and twenties were absolutely horrible, but I think that is true of many of us on the spectrum. My thirties saw improvement in my socializing, and I was married at 38. We are still together as a couple but have lived in separate abodes for more than half of our marriage. The 40 years of the occasional emotional overload that would send me into shutdown or a meltdown gradually decreased as I learned how to deal with them. Now whenever I feel myself slipping towards one, I have developed tactics to push through them and end them in a speedier and healthier fashion.
I have not been deeply depressed in some forty years, thanks to my resolution of a three month continuous depression. That shifted something in my brain chemistry I think, but I have no explanation backed with empirical evidence.
I may be the odd person out, in some ways, as I consider myself less autistic with age. Sure all the signs are still there if you spend enough time with me, and it isn't due to masking, as I stopped doing that decades ago. I have a habit of blurting out that I am high functioning autistic to strangers. I do this in an effort to educate the ignorant about what autism is and how I consider it a superpower. It certainly helped make my life better, even with all the contentious moments that arrived unbidden.
I have numerous MRI scans of my brain and I found the medical analysis of them amusing. None of those had anything to do with my autism, but they provided some illumination.
I guess it may be due to my finally arriving at a place where I like myself and I am comfortable with all aspects of my being. How did I get there with so little strife? I have no idea. I feel for anyone who is struggling. I wish I could tell you how to get through whatever problems you struggle to deal with. It can't be my intelligence for their are autistics that test a higher IQ than myself, but then I was always horrible at timed multiple choice tests (one of my more persistent autistic downside. whatever it may be though, I am grateful for it.
That's my story and I am sticking to it.