[img]https://4.bp..com/-97khFIQjpS4/WVqSNwGptVI/AAAAAAAADv4/uF2wqDdQJikLSWC5j5cmexMSJQXNFmuAgCKgBGAs/s1600/14991078435581217573561.jpg[/img]

Waiting until forties before trying to become fathers could reduce male fertility because sperm DNA becomes damaged with age.

Frequent cell division to make new generation of sperm daily increases errors in cell formation as men get older and the risk increases everyday. Genetic errors may get into sperm as men aged.

The cumulative effect of these errors as cell division goes on and on and on affects children produced by older men. Autism, epilepsy and schizophrenia are associated with older sperm.

Older men may not be able to impregnate a woman naturally, it may take a long period of time to archive conception and risk of miscarriage is...
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There is no universally accepted known cause of autism, but scientific speculations have pointed to genetic and environmental related factors, check www.ikefoundationforautism.org for more information. I agree with you that early child birth should be encouraged, where possible, but I don't see it as a serious cause of neurodevelopmental disorders.