Teenagers: selfish and narcissistic beings?
If so, why just teenagers?
Yes, they're becoming independent. And the brain is doing some neuron thingy (recent nytimes article) and this means that their mind is opening up and grasping all sorts of new things, and identifying relationships, and such a great amount of "real" (applicable, and usually factoid) knowledge is being generated that it brings on a sense of power, and even invincibility. Yes, hormones are running, raging, rushing, and generally being and rumbunctious as ever.

But, why just teenagers? Why that specific demographic? Is this something one grows into and out of? The narcissism, the over-whelming self-belief, the invincibility? Is is just a mis-communication between one generation that is coming of age, and the others that are there already?