Lots of good answers here.
I never considered the two linked, here are a few of my thoughts on the matter.
The decision to have children should be about the child.
Are you mature enough and finacially secure enough to have a child? It is a huge responsibilty; timewise, fiscally, emotionally etc.
I refrained from having children because I didn’t want to take the risk that it would mature me enough to be a good parent. And I wanted to make sure I had a partner who I could envision as a good parent figure as well as someone I could get along with and make responsible decisions with together for at least the minimum 18 years. Even if the relationship itself fell apart, which I would hope to avoid.
I have had friends that have gotten pregnant young and not in the ideal circumstances they turned out to be great parents. They grew into the role. But we are all different.
Some didn’t.
I would consider it selfish just to have children to fulfill some bench mark etc.
The flip of that I suppose would be and mind you I have just heard this from males: is women refrain from having children to avoid what it does to their bodies. Maybe a few do. But if they have that opinion should they really have children?
So those are some thoughts I wanted to elaborate on in regards to this topic.
Edit:
Most doctors won’t consider tieing women’s tubes even if they have had a few children and are still young. I have heard instances where the doctor has refused after there were medical complications with the pregnancy but when the woman did become pregnanct again they advised aborting it. What is up with that?