The 2018 Forbes rich list of the world’s billionaires released in February also has the world’s youngest rich people.
The top 5 youngest billionaires comprise three Norwegians, an American and an Irish.
The youngest billionaire in the world is currently just 21. Alexandra Andresen and her sister Katharina, 22, each have an estimated wealth of $1.4 billion (£1 billion).
Meet the five youngest billionaires in the world in 2018, according to Forbes, ranked by age from youngest to oldest.
1. Alexandra Andresen
She is worth $1.4 B, from Norway. Alexandra Andresen, born in 1996, is the world's youngest billionaire at age 21.
She and her sister Katharina, one year her senior, each inherited 42% of the family-owned investment company Ferd.
Andresen's father Johan still runs the company and controls 70% of the votes via a dual-class share structure.
Ferd runs hedge funds, is an active investor on the Nordic stock exchange, and has private equity investments.
2. Katharina Andresen $1.4 B 22 investments Norway
3. Gustav Magnar Witzoe $1.9 B 24 fish farming Norway
Gustav Magnar Witzoe owns nearly half of Salmar ASA, one of the world's largest salmon producers.
His stake was gifted to him in 2013 by his father, Gustav Witzoe, who founded the company in 1991.
Salmar has led the industrialization of fish farming in Norway, refining the product into more sophisticated cuts with higher margins.
4. Evan Spiegel $4.1 B 27 Snapchat United States
Snapchat creator Spiegel became the youngest public company CEO when Snap began trading in March 2017.
Each day some 170 million people, mostly teens and millennials, use Snapchat to send disappearing messages.
Spiegel co-founded the company with Bobby Murphy, a Stanford University fraternity brother, in 2011.
Spiegel and Murphy each own about 18% of Snap but have voting shares that give them control over the board.
5. John Collison $1 B 27 Stripe Ireland
John Collison is cofounder and president of Stripe, the company that lets businesses and individuals easily accept payments over the internet.
In November 2016 Stripe closed a $150 million funding round that valued the business at $9.2 billion.
He and his brother Patrick hatched the idea for Stripe while both were in college in Boston.
The company's first payment was processed while both were on vacation in South America.
John was born and raised in the countryside near Limerick, Ireland, where his parents ran a lakeside hotel.
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