As markomalley said, any couple can be willing to receive the children God gives them. I and all my “old mother” friends share some hysterical laughter over people’s idea that women in their 40s or 50s can’t have children, btw. The oldest verified natural conception and delivery was to a 56-year-old mother. (It came up on FR once.)
But even a couple in their 80s can be morally open to children.
I have nothing but admiration for your family values. The only toddlers I want running in around my house at my age (55) are grandkids (of which I now have 2).
And I’m quite happy they go home with their parents (my kids) most all the time. The occasional weekend, fine, full time, not so much. Been there, done that. Loved every (nearly every) minute of it. But the baton has been passed to the next generation.