I personally know several elders with no children. And this was in Brazil, where parents with 4 or 5 kids are not uncommon. The comment - usually delivered jokingly - is "I want perfect kids", and of course, they mean in the "new system of things". ha ha ha ha
However, what I have seen too is that, in many cases, all it takes for a couple or couples to have a child is seeing a couple they respect having one. This is normal human behavior.
Observador.