2/20/2012 An obvious possibility is that older parents are more likely to have defective eggs and sperm. This is known to be a risk factor for some other problems, like Down's syndrome. However, I can think of some others. If you would like share other possibilities before I add my own, please leave a comment.
http://www.sciencedaily.com/releases/2012/02/120210133439.htm
ScienceDaily (Feb. 10, 2012) — Older maternal and paternal age are jointly associated with having a child with autism, according to a recently published study led by researchers at The University of Texas Health Science Center at Houston (UTHealth).
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