http://rugenerations.wordpress.com/2009/04/30/%d0%be%d1%82-%d0%bc%d0%be%d0%bb%d1%87%d0%b0%d0%bb%d0%b8%d0%b2%d1%8b%d1%85-%d0%b4%d0%be-%d0%b8%d0%b3%d1%80%d0%b8%d0%b2%d1%8b%d1%85/#more-151Это теория поколений.