I know this is kind of old, but thought maybe this would interest people.
Lower I.Q. Scores Among Children of Older Fathers
Talked about how children with older fathers scored lower on all cognitive tests, and showed much higher risk of schizophrenia and autism than those of younger fathers.
Also showed children of older mothers had better scores.
Whats crazy though, was that it was a linear progression in the case of dads. I wonder why that is, and if it has anything to do with this (genetic degredation), or more the nurture side.