If you were looking for a generational segmentation you would have to compare different generational cohorts at similar ages (meaning a long-term study) to have any hope of controlling for people's having different levels of maturity, discipline, social needs, and for lack of a better term, being-fed-up-with-things-that-are-bullshit. I suspect it's not generational per se, but heavily age-dependent. If you no longer crave the Twinkies or McDonald's meals you did as a kid, you kind of know what I'm talking about.