The list has existed in two phases: First, from 1999 to 2003, purely as a numeric ranking of wealth, capturing the first dot com boom.[1] The current iteration started in 2009 and is a ranking of power and influence.[2] The list includes business executives, political figures, sportsmen, fashion designers, and others who are under the age of forty years old.[3] The majority of the list members are business executives from the tech industry.[4]