This is just not true. If you are a woman, it is told to you over and over and over and over again. And women do occasionally talk about it when they talk with each other. Women even know that with age the risks are higher! Shocking, I know.
Also, average age of first birth in united states is 26.9 years old.
Yet also, those who have kids soon suffer lifetime consequences.
If you never cared about family planning or female health, you never seen it. Arstechnika, the verge or gamera sites never writes about that. But it is not society not taking about it.
The opposite seems to be true; the more support is available, the longer people try to put off childbearing.
At the same time, while in some ways people are rich these days, we can't seem to find the time or money to have kids. That's not much of a choice. It's more that people react their to circumstances. If anything it's a form of "ethical" birth control.
Of course, admitting that maybe women do know all of that and decide to not have kids anyway would be too difficult.