Interestingly, genetic mutations from the mother are roughly constant regardless of her age. Paternal genetic mutations rise with age. IIRC a 38 year old man's sperm has double the number of mutations a 28 year old man has.
> Ireland's average age of marriage in 1830 was 23.8 for women and 27.47 for men where they had once been about 21 and 25, respectively, and only about 10% of adults remained unmarried;[22] in 1840, they had respectively risen to 24.4 and 27.7;[23][24] in the decades after the Great Famine, the age of marriage had risen to 28–29 for women and 33 for men and as much as a third of Irishmen and a fourth of Irishwomen never married due to chronic economic problems that discouraged early marriage.
Doesn't really contradict what I said, although the age gap between bride and groom was fairly variable (but no country that I'm aware of has a pattern of older bride, younger groom).
When I was born in 1991 and my sister in 1995, a simple police officer and a nurse in half-time could provide for two children with ease, in one of what was even back then one of the most expensive cities in Germany. Today, me (IT worker) and my s/o (public health administration) can barely afford a flat and two cats.
Fuck that shit, we need rent controls, higher wages and higher taxes on the rich. Then people like me are not forced to wait until 35 that they can start having children.
Energy, on the other hand, not so.
The main exception I can think is family support; having younger grandparents and great grandparents could be an advantage, I guess?
I'm not sure I'd look at a society where people have lots of children so they can put them to work and say "yeah, this is the way society should be!"