I would say about 24. She’s not childish like a teenager. And not too career-oriented like a 30 year old. Its when woman are at peak femininity.
So when do they become “bitter and barren”Biologically it’s about 24. Form then on fertility decreases rapidly, and so does collagen production ( it starts at 20 but gains in speed at mid 20s).
But of course based on other factors - it depends on the individual.
I think that's weird. I want 10 kids right now, but I also don't want 10 kids because that's stressful at any age.