This is not based on a survey but only from my observation. I learned of autism when I first saw an autistic child sometime when I was in my 30s. That means there was no autistic in sight before that day. Eventually, I have been seeing autistic persons. There are 2 nephews in the family of my husband, 2 in our neighborhood and 1 autistic child of a colleague. I am wondering if autism is really getting prevalent and what causes it? If it is genetic in nature then why is it seeming to be widespread now?