The reality is: the decision to start a family it isn’t just about you. It’s also about your future grand kids. And while 40 might seem like it’s the right time for some…it’s rarely ideal in the grand scheme of things- that puts you at a strong chance of having health issues while your kids start families of their own. But meeting your grandkids if your kids make that same choice. It’s best I think to be at that phase in life when your kids are a bit more settled.
On the other hand I think normalising most men marrying 30 year olds at 45 opens society up for a variety of problems. And that seems obvious to me even if I don’t think it’s true for everyone- or my relationship. That on a larger scale…it would cause problems. And perhaps aggravate things for the younger generation of men quite considerably.