Already in their 30s they panic. I know several cases of friends that hit 30/ 35 and then got married and had a kid. One of them was a higher up at a bank, made a lot of money and now wants to give it all up to focus on her kid because her kid makes her happier then her job, it does help that her husband makes a lot of money. 2 others had a kid by "accident", as in straight out lied about being on the pill. Mid 30s those very happy women hit a big fucking reality wall.