I have an acquaintance whose grandchild was diagnosed with Autism. She’s a health pro herself, and said that there is a growing conviction among researchers of Autism that later-life parenting is a factor. She said that there are very few young parents (under thirty) of autistic children, and that even older fathers and young mothers have a higher incidence of austism than young parents.
The correlation is with older fathers, and not with older mothers, as I understand.