In 2007, doctors at Kaiser Permanente hospital in California published the results of a study they had conducted into autistic spectrum disorders. They found that the older a parent was, the higher the risk that their child would be diagnosed with autism. The risk was increased for children of parents who were 34 years or older and for every decade of increasing age.

133,114 children were enrolled in the study and of these, 593 had an autistic spectrum disorder, either autism, asperger’s syndrome or pervasive developmental disorder not otherwise specified (PDD-NOS).

The authors wrote:

‘The reported prevalence of ASDs has increased significantly during the past few decades, in this same period, the mean age at maternity and paternity has also increased.’

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