“not get rid of defective sperm as effectively as younger men. And they also found a link between increasing age and the number of defective sperm a man has”
No dispute. What is also said in that statement - as in “number of defective sperm” - is the fact that (a) not all sperm in an older man are defective, and (b) as I said in my previous post, invitro clinics are well aware of this and fully capapable of analyzing a sperm sample and selecting those found not to be defective. They do it all the time for male clients, on their sperm sample, at any age.
But, everyone just wanted to be part of a bigger story.