Earth 21

In this reality all adults over the age of 21 have disappeared. Where to? Nobody knows. Society has crumbled, mainly because most world governments were made up primarily of adults over 21. The oldest and wisest of the remaining members of the world had formed a lot of smaller regional governments, until the intervention of Carl Woden Prime, who operated behind the scenes to establish a one earth government with his counterpart on this earth, a 17 year old genius, in charge.