It's also true having kids is a major lifeshift that may not turn out how you hoped and you'll end up with plenty of emptiness inside you.

People report they gained from having to 'move up a level', without kids you are someone's son or daughter and that's it. Having kid(s) you become someone's father or mother as well which changes you hopefully for the better.

Someone has to pop the next generation out. They will look much like whoever did that. They won't look or think like the ones who decided to sit it out.