You seem like a bit of a crazy person…
50 to 100 years ago qualifies as a “modern social construct”. It’s nothing to do with nature.
As a twenty year old, my girlfriends were always older. In fact, with my age first and the female second, I can list the ages of some of my partners growing up.
13:12, 14:25, 16:18, 16:23(Yes, I had more than one girl sometimes), (forgotten the details of my 20’s ☺️) 31:18…
Differing needs, different partners. Gaining knowledge and experience along the way. It’s normal.
In the end, you find partners who fit with you and you with them.
I agree that they should not be children. But the world is not as you would like to imagine. Reality is different from your socially influenced mind.