There is a theory that's it's the man's sperm at fault here, not the woman's eggs. Specifically, that after 20 years of marraige, couples are having sex a lot less frequently and that fertilization can take place with an older, less viable sperm that's several days old rather than being out-raced to the egg by a fresher sperm.
The interesting confirmation here is that 40-year-old newlyweds don't have any increased incidence of Down's Syndrome babies.
I do hope there is something to this. Just like the witch-hunting days in Salem, men lay a lot of their own hangups and repression on women. I know I'm guilty of that a lot of the time.
Interesting you mention that - My parents had me 50 weeks after they were married - at 42 and 41
Alan Colmes can speak for himself ;-)
Cheers!