I think it sounds like a dreadful idea to those of us who already have children, however there are considerable differences physically, socially, emotionally and economically between women who are already mothers and those who are in their forties without having gone through pregnancy, birth, sleepless nights, all the stress etc of having children.
Those approaching or considering first time motherhood after 40 tend to have a biological age several years younger, be more resilient and often more financially secure.
I went through several rounds of IVF in my early 30's and made a few friends several years older pursuing treatment to become pregnant for the first time, and it was interesting to see the differences.
I think there are definitely some advantages but in my experience there are two things I would caution on -
One is that older parents are more likely to experience the onset of health problems and even in some cases pass away, whilst their children are relatively younger compared to people having kids in their 20s. This isn't a given obviously, but more likely.
Second is that IVF is not a treatment for age related fertility decline unless you either froze eggs or embryos years earlier, or are using donor eggs.
A lot of people think "it's ok if I've left it too late, I'll just have IVF" You can spend thousands of pounds to get your eggs into a Petri dish but those eggs are still 40 odd years old.