It seems that ova and sperm have a similar shelf life.
According to a significant new study, men over 45 have a vastly greater chance of fathering children with mental disabilities
Via NY Times (Emphasis added)
Compared with the children of young fathers, aged 20 to 24, those born to men age 45 and older had about twice the risk of developing psychosis, the signature symptom of schizophrenia; more than three times the likelihood of receiving a diagnosis of autism; and about 13 times the chance of having a diagnosis of attention deficit disorder. Children born to older fathers also tended to struggle more with academics and substance abuse
Bad news for Trophy Wives and their Hedge Funders looking to start that de rigueur 4-child, 3rd family.