I would assume it was meant to be and listen to my wife's feelings on the subject. I'd "man" up (again). Of course, I'm a woman, so I am saying what I would want my husband to do.
As a woman who has had ectopic pregnancies since having her tubes tied 17 years ago, I would rather HAVE a baby than lose another one (though I obviously chose to stop a long time ago).
And the Down Syndrome remark by someone else was just idiotic. For one, my young daughter has a baby with DS and I know a 47 year old who recently had a VERY healthy baby. For another, when you love a kid who has Down Syndrome, they bring NOTHING but joy to your life. Okay... so that wasn't the question... but if DS is a concern for an older couple, they should know all the facts before choosing to end a kid's life for not being perfect.