A University of Queensland, Australia study suggests that becoming a father at age 40 or older is linked to baby at a higher risk of schizopherenia, autism and syndromes that cause facial and skull abnormalities. They also found that those born to older dads scored more poorly on a range of intelligence tests that looked at concentration, memory, reasoning and reading skills.
supporting link--------
http://www.newscientist.com/article/dn16719-older-men-may-have-less-intelligent-kids.html

older moms have higher risk of having trisomies like down syndrome etc

the thread is interesting, but we are missing denominator (large population ouside this forum)