Just based on the biology, and not discussion of other societal factors, child birth in her 20s seems ideal.
I think a problem is that we don’t talk about family life or people’s futures in marriage or having a family. Thsnis not just for women to think about; men also, should be thinking about their roles as fathers and husbands in their futures.
Does anyone talk to teenage girls about their futures as wives and mothers?
Does anyone talk to teenage boys, about how they can be husband and father someday?
It’s as if peoole expect that , children and families are an afterthought.
That comes up against the simple math that the more money you sock away in your 20s for retirement will allow for a much easier retirement, than if you only started to save in your 30s.
Having a family and incurring those expenses will cut into that, big time, so they believe it’s better to wait until their late 20s/early 30s to start having kids.