The only logical answer here is youth. The younger you are the more fertile you are. This is true for both men and women, but more true for women. If you want children at some point in life then prioritize children first and early. I know, this puts your ambitious career on hold for a while and start ups require huge ambition. Still, start up opportunities will not be hyper critically different in the future than the…
edit: I won't be further commenting on the topic because the same people asking everyone "when are you going to have kids like me?" are just going to downvote. Yes, I rather see an end to humankind because that ends suffering. Less suffering in a universe is better than a universe that experienced more. Yes, nobody cares about the ones that wish they never had been born because of whatever reason that was inflicted upon them.