Science and actually, good health, does allow this, and 40s to 50s with technology. You just need to be rich enough to save your eggs while you're healthy. Then you have more time. I honestly feel like I'm reading an analysis from 1970. When I read those first few paragraphs. Then you move into this century.

With most rational people they do know that being closer in age is a advantage. But unless the younger one is really young, most people get over initial objections.