[xjcsa]

If she keeps having kids at 42 plus years of age, she is at real risk for a handicapped child.

Stop while ahead IMO.

I'll expand on my "wow" post. I would ask you this: why would you assume that this family shares your "values" (such as they may be) and attitude toward such children? For that matter, why should they care whether you think they should have more kids? And what business is it of yours?

[A CA Guy]

It isn't about their wants, needs or values. It's that they are getting into an area where they are at high risk for having very sick or mentally impaired children.
If they have 19 healthy ones, count your blessings but be responsible and don't continue to have children when you are older and it is dangerous.

Just common sense.
Nothing wrong with using the brains God gave you.
I'm not talking medical secrets here, most women know about risks of having children late in life.