John Collison is the youngest self-made billionaire

Irish entrepreneur John Collison is the world's self-made billionare, according to Forbes.

He is one of four self-made billionaires in their 20s.

The 27-year-old co-founded with his brother Patrick San Francisco-based Stripe, a software platform that enables online payments.

John is just two months younger than Snapchat's Evan Spiegel, The Irish Times reported.

At just 17-years-old, John founded an online auction-management system called Shuppa in 2007. He later sold it in 2008 for $5 million reportedly.

Collison also studied physics at Harvard University before launching Shuppa .