If maturation is 16 to 24 parents should have enough life left to see their children reach it. If you have a child at 60 you would be 76 to 84 by the time the child is an adult. Perhaps too old for a quality relationship.
I think people can and should do what they want to do, especially personal things like this. For me, 31 was a perfect age. My first was born when I was 26 and that was a little young, and by that I mean I was still very much enjoying being married without the responsibility of children.