I really feel for the women here who have not had children even though they wanted to be mothers
But as I've said upthread @weeddigger it's not an either/or for everyone - well, at least, not for me. I haven't read the whole of the thread PPs are linking to, but I suspect that, had I found myself pregnant in my early 40s it would have been a miracle, really I might have been very ambivalent but also not unhappy with the idea ... I don't know.
It was out of the question for me because ever since a break up in my mid-30s with the person who I thought was my life partner, I've been single & celibate - none of this by design or voluntarily, it just happened.
I went through a lot of baby-yearning in my 40s, but I think it was long grief for the relationship which for me, was the one. I wanted the whole package: husband, children settled life etc etc.
Now I look back and think "Thank Goodness!" - I have a rather lovely life, and it's all mine. But my late 30s & 40s were difficult, and I'd never say I was always & deliberately childfree.