I don't have kids, but I have a horse farm where we do reproductive AI work. Having 4-8 foals a year for a few decades allow a person to see a lot of things.
It is hard because having children is a highly personal choice for a couple. If one focuses on the pure biology of it, it sadly raises the anxiety levels which in turn makes it more dangerous.
The harder part actually comes down to the guy as most women are highly aware of their reproduction systems.
Men are the other 1/2 and poor lifestyle, and a variety of other things are now being seen. Sadly, as I found out if you put 20 people in a bar equally spaced out gender wise.
If you ask a simple question, do you have GP and do you see a doctor, the spread of men answering yes would be very small 2-3 out of 10, while women would be the inverse.
I have been fighting a bad set of side effects with a immunotherapy drug due to serious allergies, and having discussions with my GP was interesting because the male intern with him fidgeted.
I kept thinking to myself, this is why I requested a female GP but was denied, but whatever. The male primary GP actually is very good with tremendous bedside manner.
I am hoping longer term for Gen Z's kids that the stigma goes away so women of Gen Z later in life can feel safe and secure in having children later. Sadly Gen X and Y are "done" done as that ship sailed.