Grandparent parents - how old is too old to have a child?

Off the back of the post where the grandparents used the embryos of their dead children to create a baby - some people noted that it would be unfair to the child as the grandparents are old and may not live much longer....

So my question is what do you think of people having children later in life (40s) and for men (50s-60s)? Do you judge them? Do you think it’s unfair to the baby? Do you support them?

At what age do you think people should stop having children?

Personally I am okay with it. I have older parents and my husband is also an older parent.