Verified answer

No, by definition it has to already have developed by the age of three.

However, you can be diagnosed at any age- I was diagnosed as a teenager myself.

If you are having an intensification of symptoms already there, it's possible you are autistic. Otherwise, no.

The diagnostic categories have just been changed so that instead of the types being Autistic Disorder, Asperger Syndrome, and Pervasive Developmental Disorder Not Otherwise Specified, it's just Autistic Spectrum Disorder, mild, moderate, and severe.

There are many many many related disorders, including sensory integration disorder, attention deficit disorder, dyspraxia, nonverbal learning disability, and more.

You probly don't have it. Don't self diagnose because youll find you have everything