I was diagnosed at the of 30, this year.

I saw a shrink at the VA about 10 years ago and even though I wasn't officially diagnosed, it was implied that I have Aspergers.
After researching it, I was able to understand my weird adolescence, why I think the way I do, and now I embrace having it.
Now that I understand it I feel like I have a superpower.

I stumbled across my symptoms as being on the spectrum at 59. I don't have a definite diagnosis. (My mistake was going thru the VA and having an old male doctor do the exam, but that's another story. )
If you are functioning now, you're not going to get any special treatment. As far as declining as you age, I would mention the concerns to your primary care physician. It's your mental state that will qualify you for help no matter what the cause is.
There is a group on Facebook of ASD people to which I belong. (There are several such groups. ) PM me if you want the name and link. It's a private group, though fairly large.

I was born in 1930 and was in my early twenties (the early 1950s) when my mother told me I didn’t talk until I was four. For info, do a search on “autism timeline”.

By the late 1970s, when I was nearing fifty, I knew the word “autism” and wss living in San Francisco when I heard that the city was starting a study to learn how a city agency might treat autistic clients. The study was looking for volunteer workers and I figured how better to learn about autism than to volunteer. i was interviewed but must have flunked because the interviewing panel seemed in a hurry to get me out of their office.

In 2013 I learned the reason both of my long-deceased parents seldom spoke and realized that my not talking until I was four might have resulted from not hearing words I could mimic. I’m now 89 and have decided to ignore the whole thing.

Often wondered about that myself .

About 15 yrs ago, when I was 50, I was being treated for depression, and the shrink strongly implied I had Aspergers, but wouldn't actually diagnose it. I researched it online, took an online Aspy test, and yes, I'm an Aspy! And I suddenly realized why Mr Spock was always my favorite Star Trek character! Why woudn't the shrink diagnose it? I don't know. I think she wanted to encourage me to research it myself, for whatever reason.