My husband and his SIL were born to a mother who was over 40. This many decades ago. They turned out fine (well his sister is kind of a nut, but I blame other factors for that).
I think the "breed young or regret it FOREVER!" message is so insulting to women in general, but sadly I don't think most women see it that way. Most don't seem to see that this is emotionally manipulative propaganda designed to get people breeding and consuming. The implication is always that the 40 year old woman is so "selfish" because she skipped out on breeding in her younger years in order to have a career. Message: You're not selfish,
are you?
I believe that nature is trying to tell us to slow down with the breeding. Actually I think it's probably a combo of this and maybe even environmental factors (chemicals in the air, water, food supply etc.) that are influencing infertility. Instead of listening, we devise ever more ways to "treat" infertility and continue to add more numbers to the exploding population.