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There are about 47 self-made billionaires under the age of 40 in the world, according to the latest Hurun Global Rich List released on July 4.

These young self-made billionaires' average age is about 36 and they come from eight different countries, Shanghai-based Hurun Research Institute reported.

Wang Tao, founder of Dajiang Innovation Technology Co (DJI), is the only Chinese self-made billionaire ranking on the top 10 list.

Let's take a look at the top 10 self-made billionaires in the world under 40.

No 10 Joe Gebbia

Wealth: $3.85 billion

Company: AirBnb

Age: 35

Age when made $1 billion: 33

Time it took to make $1 billion: 7 years

Country of residence: US

Joe Gebbia (L), the online accommodation provider Airbnb co-founder and chief product officer, announces their partnership with the Brazilian Olympic Committee for the Rio 2016 Olympic Games at a press conference at the headquarters of the Brazilian Olympic Committee in Rio de Janeiro, Brazil, on March 27, 2015. [Photo/VCG]