Teenagers in their last two years of high school are the coolest people on the face of the planet! That means sixteen and seventeen year olds. After that they join the rest of us on the down hill slide.

They have the fastest, fickle fads of anyone and there is no one who can keep up with their highest level of cool.

Lady Gaga? She's 25. Washed up.

Robert Pattinson? Fogie.

Tutankhamun? 18 or 19 - see .. one or two years only and the rot set in there.

Justin Bieber? Oh well. There goes that theory.