I realise I'm totally detracting from whole polio argument happening here...
I just wanted to say I find the older father thing absolutely hilarious. My husband was already in his 50s for our first child, and now we have another on the way, and we have absolutely no concerns. Another person in my family fathered a child in his 60s, and no problems. I know loads of people who have fathered children in their 40s and 50s,and who could freakin' begin to count the guys in their late 30s fathering children. The only one I know with a child with some developmental issues smokes around the child, vaccinated the child and the child lives on stuff like Captain Crunch. They have no regard for chemicals in the environment, like in foods, cleaning products, laundry detergents, fabric softeners, plastic toys and mattresses (does anybody think about how many hours of your life you spend laying on that thing breathing flame retardant chemicals and pesticides? buy an organic mattress or an allerzip for pete's sake, and if you're in the States you have to have a doctor's note to be able to buy an organic mattress without the flame retardant stuff).
I personally don't plan on having children in my 40s because I believe there is an increase likelihood of things like Downs. I believe this has more to do with my body's ability to get what is needed to the fetus for development and hormone changes and things like that than anything to do with my husband's sperm. To the best of my knowledge DNA does not degrade over time whether you are male or female.
I would suspect people who are willing to do IVF to get pregnant are much more likely to have other chemicals and toxins in their life in other ways when odds are it's all those very things causing the infertility. There are way too many environmental factors to consider including vaccines.
And by the way, my undergraduate work was in statistics and all these studies are a joke. The study says what the person who paid for it wants it to say. If a pharmaceutical company wants vaccines to be found safe, they are going to fund a university research study to get the finding. If Dr. Mercola wants to fund a study to say people should use his products, that is what it is going to say. If researchers don't like the results, they remove part of the group or change the formula. Anybody who pretends this doesn't happen is a fraud. It's amazing how little adjustment can take your findings from insignificant to significant or vice versa if that's what you want. Ptooey on them. Go off your personal experience and the experience of people you personally know and trust and bugger the rest.
It's fairly unlikely you're going to change anybody else's mind anyhow.