By the time you're in your 40s, you likely have a good idea of whether or not you're a stable enough mind to commit to the minimum 20 years required to uplift a new human adult.
It also won't be long before we have artificial wombs and can create embryos more expressively than the current 1 male 1 female demands of nature.
I see a future where one waits even several hundred years and dozens of careers and lifestyles before choosing to combine their genes and memes with others to spawn and raise a new consciousness, maybe even committing to a hundred years to raise it.
It does seem like a good practical/pragmatic approach to raising a family.
The normal coupling differences were much smaller typically. (Like 6 years or something).
Being the 40yo guy marrying the 20yo girl is like being the 40yo guy daily driving a Ferrari. Sure there are some pretty big downsides in the practicality department but you're rich enough to paper that over (this sentence is specifically crafted to apply to both parties).
Gives women options.
The earlier you freeze them the more you can get with a single procedure
25-35 seems to be the ideal window, where the parents have had ample opportunity to get to know themselves as individuals, and the risks of a severe disability aren't particularly elevated. Afterwards, the risk seems to climb very quickly.
https://www.med.stanford.edu/news/all-news/2018/10/older-fat... https://www.ivf1.com/age-birth-defects/
My parents fought about money all the time, but if they had delayed then they would have been better off. If they were better off then maybe my mom wouldn't have killed herself...
My earliest kid I had at 21; my latest, at 45. Sure, I have more money and emotional stability now. But I was also a lot more active back then, with the ability to deal with sleep deprivation when the kids were infants, and to handle playing tag after work for an hour.
Plus... whatever emotional strength and resilience I have comes in large part from being a practicing father for 20+ years. If I had been childless this whole time, I'd have far less emotional growth.
I'd recommend couples at least consider having kids as soon as they can (a) drag themselves out of poverty and (b) have enough time together that they have some confidence their relationship won't fall apart. Maybe (c) have some 3rd party backup.