Today's teenagers are more materialistic and less interested in working hard than the baby boomers were in their teens, according to a new study. But sorry, boomers, the researchers say it's probably your fault for creating a culture that breeds narcissism and entitlement.

"You're taught what's important and how to act by your parents, the media and those around you," said Jean Twenge, a co-author of the study and professor of psychology at San Diego State University. "It's the cultural changes that are really bringing these changes."