By Amy Langfield, TODAY contributor

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.”

It’s not just millennials who are materialistic, according to the study published Wednesday in the Personality and Social Psychology Bulletin. The money-hungriness actually peaked with Generation X and has declined somewhat since then.

Among high school seniors, the need for money was highest around the end of the 1980s. For a cultural reference point, think 1987’s “Wall