I recently became aware that all of the popular Christmas Songs are from Baby Boomer's childhoods- I am now curious what other facets of popular Culture are controlled by a demographic group?

I will try to be careful in the details. Most people either enjoy Christmas or are forced to deal with Christmas music in some manner. All of the popular Christmas songs were popular when baby boomers were children.

Are their any other mass experiences you find yourself participating in you believe are solely dominated by the tastes of one particular demographic group? I am not trying to imply a conspiracy. I am sure most of these things evolve organically.