The mutations in sperm that increase with age are calculated to only cause less than 20% of autism.They give some scenarios that increase that a little, but they all show this is not primarily a genetic problem.
All the data indicates autism is an infectious/immune problem.
And older people are more likely to have acquired chronic infections.
And infections are contagious FFS!
If subclinically sick old men have transferred certain microbes like flu or strep to their baby-mommies, that would easily explain this outcome.
