[Citation needed]
I was under the impression the drop off for men both progressed slower and was less severe than it was for women.
e.g. a 40 something woman has the same chance of having offspring with Downs Syndrome or other congenital defects as two cousins in their twenties inbreeding, while a 80 year old man with a 20 something woman is still less at risk than both of the aforementioned pairs.
