Are there any music, tv shows, and movies that 7-10 year olds watch that is the same as a 15 year old?

i heard some kids watch stuff like Family Guy and some of my little cousins (between the ages of 3 and 9) sing to Flo Rida, Katy Perry, Pink, Taio Cruz, and anything on z100, to the Jonas Brothers and Hannah Montana. So it seems it's kinda mixed between kid stuff and teenager stuff.