Never been diagnosed. The odds are against their getting it right. I am mature, and female. Post-parenting. Well-camouflaged. And now I never will, because it would hurt worse now being told I wasn't AS when at last I have a way of loving myself, because I understand and therefore can forgive, instead of living a life of remorseless self-recrimination.
I didn't go out looking for this; I stumbled upon it. Had to look up the spelling at work ("Is it a U or an E?") and the reference I found listed a simple dozen or so characteristics. My stomach did that instant-bruise/suckerpunch/gasp thing, when your gut knows something before your brain does. I marked it as something I HAD to go back and read. It was like breathing after holding your breath. Everything I have come across since then, except the DSM-IV, puts me strongly on the AS. My life replayed itself, every awful moment and unfathomable mystery that was ever stored away in memory, right back to childhood, and EVERYTHING fell into place through the AS prism.
It was such a relief! Did this mean I was not the waster, lazy, loser, unlikeable, unlovable - did I say waster? - depressive, ungrateful, angry, awful wastrel who had had so many advantages and talents she should really have made something of herself and held down that job, or lover, or university course, or gig, instead of frittering or drinking away all that glittering promise? Probably not. You can't live that life for decades without in part becoming that person. :-/ While floundering around I had one massive piece of luck, and that was to find a music community of which I became a respected member, and that is where I have found lifelong friends.
Now my SDX means I can live with myself - that maybe some of what went wrong was not mine to wear - that just because someone says something to you about you doesn't mean they are right. (I don't really think I'm an awful person. But I do feel so much time has been wasted. If only I had understood sooner, I would have started growing my strategies sooner. Maybe I wouldn't have pushed people away so much, and would maybe have had "more to show for it", as they say. Maybe I would have lived the artist's life I had been destined for, instead of flogging myself contrarily to become a lawyer in satisfaction of my parents' ambition ... which I only lasted five minutes at after 15 years of on-again, off-again study ... see? I can stick with something after all!) Maybe, maybe, maybe.
Doesn't matter. Now, thanks to my nondiagnosis that nonetheless has the ring of certainty, I feel I have it within me to be happy. I have rediscovered the two-year-old who was sunny all the time, who was lost and who I could never reconcile with my inner landscape ... but can now. She bobs in from time to time and that has been so worth waiting for! I love being that person. Now want her to become the leader. Wish me luck.
I would be very interested to meet other self-identified AS aged post-45. In that demographic we, the identified, are quite a rare breed (although there are many unidentified survivors out there, says my A-dar). Care to introduce yourself?