Reuters Facebook CEO Mark Zuckerberg.There may be some truth to the old adage that with age comes wisdom. If you're in tech, however, youth is no obstacle to success. 
Some of the most successful tech entrepreneurs of the last decade have taken their companies public or sold them for millions before their 30th birthdays.
With the help of Forbes' billionaire list, we've ranked the youngest tech executives to accrue billions of dollars of wealth.
Each billionaire appearing on the list is under 40 years old.