I wish this were true. The impression I get is more of numb, passive contentment, at least from enough people in this demographic that it is bothersome. They seem to have traded happiness and fulfillment for the image of happiness and fulfillment, and it is difficult to tell the difference until you ask the hard questions that make them feel uncomfortable and defensive. That's why most people don't, and that is why the groups are assume to intersect perfectly.
There are things in life one must attend to that likely force people to get 9-to-5's. You know, like a wife and kids.
How much of this is a must, and how much is a result of choices they made? And how much of this forcing is a result of emotional and social pressure, as a result if imminent, tangible risk? That is, how much is a result of wanting to convince others that one is a responsible parent, as opposed to one actually being irresponsible?