http://www.npr.org/sections/health-shots/2015/06/10/41320592...

Worse, double the risk of schizophrenia for children who have dads at 40. Triple at 50.

http://www.schizophrenia.com/prevention/older.htm

Other mood and psychological disorders are linked to father's age as well. Turns out sperm and eggs are delicate and after 40 years of aging, simply can't do their jobs well. Evolution's mechanisms aren't kind to older parents.

>She added that some of the genes that contribute to geekiness and academic success might also lead to a higher risk of autism when a child inherits more of them.

http://jamanetwork.com/data/Journals/PEDS/15536/poa60107t2.p...

It increases from a .6% chance to a 1.7% chance.

Considering most parents only have one to three kids that's really good chances.