There is this strange global disconnect between Autistic children and Autistic adults. As if children with Autism never grow up or perhaps outgrow their Autism, and adults with Autism developed it later in life. But no, man. That is not how it works.
You don't come down with a case of Autism like one might come down with a cold, likewise you do not cure a case of Autism either like one might get over a cold.
Autistic adults were formerly Autistic children. Autistic children will grow into Autistic adults. This is how it works. This is how it has always worked. It doesn't "come on" out of no where. It doesn't "go away" as you get older. You're either born Autistic or you aren't.