I think it's more to do with the fact that a teenager wants to break free from their family and start working as an adult. They've never worked before in a "career" (most of them). So it's new and exciting.

Then once they reach about 30 they realize family is what mattered the most, work is just a means to an end most of the time and it's really hard to make your "mark" on the world. Why not make your mark in a smaller way that's more guaranteed? By being there for family and friends