That’s also my experience. Specially for women in and my wives close environment.

90% or more wanted to have kids. But the ones that started after 35+ or didn’t have a partner until that age did struggle a lot, and many never managed even after investing 10a of thousands of euros on fertility care.

They prioritized lifestyle and career before family. Then it was too late to have both.

There might be many metrics to measure fulfillment in life, but if I had to choose one, I would probably stick with love. And nothing fills my love cup more than having a large family. YMMV.