I was diagnosed in 1995 when I was almost 15.
What I was diagnosed with is a little more complicated. What they told my mother was that I was autistic with idiot-savant features. What they wrote on paper could be PDD-NOS, CNS disorder NOS, atypical autism, developmental disorder NOS, etc. (This was apparently because back then "autism" on its own meant "hopeless", and they didn't want to say "hopeless" or I wouldn't get the proper kind of funding or 'treatment'.) I also found a paper from around then that described me over time on a graph as low- to mid-functioning, but it was not a paper that was ever distributed to insurance companies, it was in the private notes of my psychiatrist and appeared to be a diagram he had drawn to explain something to my mother.
After some later misdiagnoses (some "instead of" autism, some "along with" autism) I was rediagnosed with PDD-NOS in late 1998 or early 1999 at the age of 18. Later in 1999, at the age of 19, my diagnosis was officially changed to autism, which is what it's stayed since. I was also diagnosed by an independent evaluator in 2002. No functioning level has been given, unless you count a score of 47 on an adaptive skills assessment done by having a staff person who'd known me several years fill out a questionnaire about me (lowest possible is 40, highest is 130, 100 is average -- like an IQ test but measuring something different). That was in May 2005 when I was 24.
I hope any of this is what you're looking for. I'll be 28 next month.
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"In my world it's a place of patterns and feel. In my world it's a haven for what is real. It's my world, nobody can steal it, but people like me, we live in the shadows." -Donna Williams