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29th November 2016
12:07pm GMT

According to Forbes, both brothers are worth approximately $1.1 billion, making John, the younger of the two, the world's youngest self-made billionaire. At just 26, he's two months younger than Snapchat's founder Evan Spiegel who also made the list.
The only other self-made billionaires on the list under the age of 30 are Patrick Collison (28) and Snapchat cofounder Bobby Murphy (28).
The youngest billionaire, not self-made, is 20-year-old Norwegian Alexandra Andresen, who inherited a 42% stake in family-owned investment company Ferd.