It always really annoys me when I see this in news articles etc. "WOMEN leaving it too late to have babies" 
In most reports it's put down to selfish women wanting to prioritize their career. Even if that's the case, it's a woman's own choice and surely women know that fertility decreases, so it's their own choice.
But in reality it has a fuck of a lot more to do with MEN imo. So, so many women I've known, including me, wanted to have babies earlier but either they couldn't find any responsible, grown-up men to have DC with until they were older, or (as in my case) they were with someone but he kept trying to put it off and saying he wasn't ready.
Some women do make a decision to go it alone but obviously that's extremely difficult and you need money and family support. And women shouldn't be judged harshly for not wanting to bring a child into the world in an insecure situation.
I've even known situations where the man has strung the woman along saying he'd be ready to have babies later, and she waited and waited, until she was nearing 40, he changed his mind (or he had been lying all along), dumped her and she missed out on having a baby at all.
Then women get "why leave it so long?"
misogynist wank.