IIRC, old fathers also increase the risk for Down's and other genetic abnormalities. Some statistical analyses also link older fathers to an increased incidence of autism and schizophrenia.
I can't wrap my head around how this issue could have any impact on the credibility of a literal Bible: anyone who already believes people once lived a thousand years will be unmoved by anything science can say to the contrary.
For example, some folks insist our DNA is deteriorating such that our puny 100-year-max demonstrates how far we've fallen from our prelapsarian ,millenium-living ancestors. In fact, in a few centuries we've nearly doubled the human lifespan, mostly due to the contributions of engineering and science: safe water supplies, effective sanitation, vaccines, etc.
In summary: don't blame it all on mom. And don't expect any demonstrable historic or scientific fact to impact anyone's belief in a literalist Bible.
Edited by Omnivorous, : typos
"If you can keep your head while those around you are losing theirs, you can collect a lot of heads."