You'll see different figures, but most articles from reputable sources say that there is a definite rise in the incidence of Down syndrome and other genetic disorders with older fathers, especially when the mothers are older as well, as is frequently the case. The overall incidence of genetic disorders is still really low though, which is easy to forget when you're reading about the percentage increase in cases of such-and-such. I wouldn't think it's high enough to dissuade an otherwise determined couple from having a kid, and I'm certainly not going to attempt to do so. What you do need to do, though, is decide what you will do if you determine that you are carrying a fetus with a genetic disorder. A blind leap of faith is all well and good as long as all the participants are consenting adults. But a baby, even a potential baby, needs a plan.
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Also, Andrea is teaching! Contact her if you're interested in (sex)life after baby classes. Her new blog is at www.gogetyourjacket.com, but don't look there for the butt sex. There isn't any.