@Howard H
As someone who has worked for nearly 40 years at one of the largest children's hospitals in the US, and with that, one of largest obstetrical units in the world associated with it. We deal with all manner of "high risk" maternal and neonatal conditions. We routinely interact with geneticists and perinatologists we have on staff. I am in neonatal medicine. I deal with the babies, or in most cases, the extremely preterm fetuses. We also deal with all manner of genetic and epigenetic physical abnormalities.
My perspective and bias, knowing what I know and have dealt with over the years, is that it is well-known within our community that "old eggs and sperm" should not combine. Clearly, all manner of genetic mutations are most common after the age of 32, and from an obstetrical perspective any woman who is 35+ is considered "high risk" and is "geriatric". Personally, I would not want the odds of throwing those genetic "dice" and potentially cause any living child to grow up with physical and/or mental disabilities.
Sure, we hear of these occasional celebrities that father children into their 50's and 60's and all of us in healthcare just shake our heads in disbelief, knowing what we know.
I know it's not our culture today for educated people to start families in our early 20's, but from the perspective of all the risk factors and biology, human beings are best suited for childbearing in our 20's.