Question: When did the youngest 2014 World Billionaire co-found a company with Paul Allen ?

text: The World's Billionaires
Annual rankings -- 2014
Main article : The World 's Billionaires 2014 Gates added $ 9 billion to his fortune since 2013 and topped the Forbes 2014 billionaire list . He had topped the list in 15 of the previous 20 years , but his previous number one ranking was in 2009 . [ 28 ] Mexican telecommunication mogul Carlos Slim came in second place after being number one the previous four years . Zara founder Amancio Ortega placed third for the second consecutive year . American investor Warren Buffett was in the top five for the 20th consecutive year , placing fourth . [ 29 ] America 's Christy Walton was the highest ranking woman , placing ninth overall . [ 1 ] Aliko Dangote of Nigeria became the first African to enter the top 25 , with an estimated net worth of $ 25 billion . [ 3 ] A total of 1,645 people made the 2014 billionaire list , representing a combined wealth of $ 6.4 trillion . [ 29 ] Of those , a record 268 were newcomers , surpassing 2008 's 226 newcomers . [ 1 ] 100 people listed in 2013 failed to make the list . [ 29 ] The number of women on the list rose to a record 172 in 2014 . [ 1 ] Approximately 66 percent of the list were self-made , 13 percent achieved their wealth through inheritance alone , and 21 percent through a mixture of the two . [ 3 ] The United States had 492 billionaires on the list , the most of any country . [ 29 ] It also had the most newcomers with 50 , and women with 54 . [ 1 ] China had the second most billionaires with 152 , while Russia was third with 111 . [ 29 ] Algeria , Lithuania , Tanzania , and Uganda were all represented on the list for the first time . Turkey saw the most people drop off the list , 19 , due to a period of high inflation in the country . [ 3 ]
The World's Billionaires is an annual ranking by documented net worth of the wealthiest billionaires in the world, compiled and published in March annually by the American business magazine Forbes. The list was first published in March 1987. The total net worth of each individual on the list is estimated and is cited in United States dollars, based on their documented assets and accounting for debt. Royalty and dictators whose wealth comes from their positions are excluded from these lists. This ranking is an index of the wealthiest documented individuals, excluding and ranking against those with wealth that is not able to be completely ascertained. In 2018, there was a record of 2,208 people on the list, that included 259 newcomers mostly from China and the U.S.; there were 63 people under 40 and it had a record number of 256 women. The average net worth of the list came in at US$4.1 billion, up US$350 million from 2017. Added together, the total net worth for 2018's billionaires was US$9.1 trillion, up from US$7.67 trillion in 2017. As of 2018[update], Microsoft founder Bill Gates had topped the list 18 of the past 24 years, while Amazon founder Jeff Bezos is ranked at the top for the first time and he became the first centibillionaire included in the ranking. In 2017, Mark Zuckerberg was the only person in the top 10 billionaires list who is under the age of 50, and the only one in the top 20 billionaires list who is under the age of 40. In 2017, 500 of the richest people in the world became richer by $1 trillion, according to a report by Bloomberg News. According to a 2017 Oxfam report, the top eight billionaires own as much combined wealth as the poorest half of the human race.
No Name Net worth ( USD ) Age Nationality Source ( s ) of wealth
1 Bill Gates $ 76.0 billion 58 United States Microsoft
2 Carlos Slim & family $ 72.0 billion 74 Mexico América Móvil , Grupo Carso
3 Amancio Ortega $ 64.0 billion 77 Spain Inditex
4 Warren Buffett $ 58.2 billion 83 United States Berkshire Hathaway
5 Larry Ellison $ 48.0 billion 70 United States Oracle Corporation
6 Charles Koch $ 40.0 billion 78 United States Koch Industries
6 David Koch $ 40.0 billion 73 United States Koch Industries
8 Sheldon Adelson $ 38.0 billion 80 United States Las Vegas Sands
9 Christy Walton & family $ 36.7 billion 65 United States Walmart
10 Jim Walton $ 34.7 billion 65 United States Walmart