Even for those stable engineers, it's hard to afford a home. Also you start earning money late at 25, because you needed those pesky degrees. Now you are 30, have a modicum of money, and want to live a little first. So you have fun until 35. Now you're looking for a life partner, you find them at 40. But you need to be financially stable, so you save up for a downpayment, you wait a few years until 45 to start a family.
You now notice you can't have kids because you're too old. The end.