I do think women are aware but agree with PP they just hope they’ll be the lucky one.
I conceived first child at 29, when hormones told me to basically! In lots of ways it would have been more sensible to wait a bit - eg we didn’t own our own house, no savings etc but I realised I was more scared of leaving it too late and not being able to have a baby than of having one at that point and sorting out all the logistics as we went along. I’m so glad we took the plunge and didn’t wait.
Now trying for second baby 3 years later and once again, not everything is perfectly in place practically (Better than they were though!) but once again the fear hit that if we leave it too late we may struggle.
I know between my parent’s first child and me being born was 6.5 years, despite them trying from first born being 2. So I am worried about secondary infertility.
I have 3 very very good friends who I know all want children. I would never tell them to hurry up etc - it’s just hurtful as they may be already trying and struggling, I wouldn’t assume they’d tell me. One has had strange periods all her life so I know she is scared she has fertility issues. One split from her fiancé when she was 30 which broke her heart, she is an intelligent woman so I’m pretty sure she knows about her fertility decking. She also cannot magic up a perfect partner to make a child with. The other seemingly has everything in place - married, own house, etc etc, but her husband isn’t quite ready. I really don’t think it’d be helpful of me to start on at any of those friends about their declining fertility. That would just be rude and hurtful. If they asked, or shared worries about waiting, yes. But not just out of the blue.