I think this will self correct within a generation, on some more or less optimal value. Because I think this is not primarily about grandparents, it is about f

I think this will self correct within a generation, on some more or less optimal value. Because I think this is not primarily about grandparents, it is about female fertility on one hand and fear of "can I provide"/"I don't want such obligation yet". I.e: my aunt had her first born when she was over 40, and knows this will be her last one. I know several of my older peers that had their fistborn roughly at 30, and they attempted the second one already within two years. I had my first daughter at 26. (Similar to my parents and parents of my wife first-borns were a kind of a happy accident :) And I can understand these trade offs. Heck, sometimes even I have an argument with my wife how much easier would some things have been if we have been slightly more careful for one or two more years :-) But I understand the sentiment about grand-parents :)