I recall when I was in my 20's, unmarried with no kids, how resentful I felt toward all of the older folks with kids. I worked a lot longer and harder than they could, and I was more focused on my work. I was satisfied with my salary, but (at the time) my company provided full medical and dental insurance for the entire family of an employee. I viewed this as a form of unfair discrimination because they were effectively earning more money (in the context of the value of their benefits) just because they had a family.

Of course once I got married and had kids, my selfish self-interest prevailed and I no longer cared about whether or not it was unfair.

Companies like Space-X and Google thrive on exploiting young single people, but on average, they can only get away with it for a decade or less (until the employee gets married).