A little unrelated, but I often wonder if the sharp increase in autism since the 1970s could be do to older people (both men & women) having more children. My wife and I are in our early 50’s, but all of our children are adults. However, we have plenty of friends in their 40’s who have infants. That was never the case 30-40 years ago.
That could be.
There is a supposed correlation between Schizophrenia and having an older father.
http://www.schizophrenia.com/prevention/older.htm
“...we have plenty of friends in their 40’s who have infants.
That was never the case 30-40 years ago...”
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As a geneological researcher, I can honestly tell you that
40 year olds having children is not now, and
has not been in the past, an uncommon event.
Maybe it’s those flat heads infants get from laying in the carrier all day at day care.