I was actually just thinking about this now. I don't think anyone over the age of 37, male or female, should produce children. Not only because you run the risk of creating tard or schizoid babies, but also because you just don't have the energy to properly raise a child anymore, and those first 5 years of a child's life are extremely important. So even if you give birth to a totally normal, non insane, non retarded child, they'll still likely grow up to be deficient in some way because you just weren't as efficient in raising them. Not to mention you won't be there for them as long. It's just selfish in every way.
If you haven't had a child by 37, then don't have a kid at all, don't even adopt a kid.