via unknowncountry by astrieber on 8/23/12
After all the controversy over the possible causes of the plague of autism in the West, a new study has finally revealed that older men are more likely to father a child who develops autism (or schizophrenia) because of random sperm mutations that become more numerous with advancing paternal age, and we live in an age of divorce, where men often remarry younger women and have children with them. The study found that the age of the mother has no effect on the risk for these disorders. While these kinds of mutations may account for 15 to 30% of autism cases, they don't necessarily account for all of them.
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