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Grendel · 3450 days ago · link · · parent · post: Women who put off starting a family into their 40s are 50 per cent more likely to have a child with autism, research has found.
I have no idea. My completely uneducated guess is that maybe there's some kind of limit to how much the age of the parent affects the incidence, so past a certain age it doesn't matter any more if the father is old himself because the age of the mother is enough to guarantee a higher rate of autism?