Age: 27
Country: US (originally Ireland)
Estimated net worth: $1 billion
Collison, the youngest self-made billionaire in the world, dropped out of Harvard at 19 to co-found Stripe, a payment-processing company used by the likes Facebook and Lyft, as previously reported by Business Insider.
Originally from the small village of Dromineer, Ireland, Collison founded the company with his brother, Patrick. Collison now resides in San Francisco, where Stripe is headquartered. The adventurous billionaire enjoys flying (he’s a licensed pilot), hiking and running.