It is the natural thing for a healthy woman with a healthy husband to have children into her 40s, no matter what age she married. I was 45 when my youngest was born, and there's every indication that I could have a baby at 48. (However, I'm not pregnant right now.)
What's wrong is the idea that a healthy married couple has an obligation NOT to have children, just because of somebody else's prejudices, "You have too many. You're too old. I could never do that!"
Okay, fine. You (rhetorical you) could never do that. You're not as awesome as me!
Glad y’all are here! You have articulated why men and women must make their own reproductive decisions and butt out of everyone elses’ lives. (And they criticize the liberals who think they know what’s best for all of the unwashed masses.)