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- The world's youngest billionaires spend their fortune on everything from luxury cars and travel to shoes.
- Norway is home to three of the world's five youngest billionaires — Gustav Magnar Witzøe, Katharina Andresen, and Alexandra Andresen.
- Only two of the world's five youngest billionaires are self-made, according to Forbes.
- Visit Business Insider's homepage for more stories.
For most people in their twenties, life is a constant balancing act of paying off student debt and finding the funds to be independent while still having fun.
That's not the case for the world's super-young, super-rich elite.
We took a glimpse at the lives of the world's five youngest billionaires — all 28 years old and under — to see how they spend their days and their seemingly unlimited funds.
From zooming Ferraris to international dressage competitions, scroll down to meet the world's five youngest billionaires, presented by age in ascending order, and see how they spend their fortunes.
SEE ALSO: 5 Hollywood celebrities who became billionaires and are vastly more rich than their peers
At 21, Kylie Jenner is the youngest billionaire in the world.
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Source: Forbes
She has a net worth of $1 billion thanks, largely, to the success of her makeup company, Kylie Cosmetics.
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Source: Forbes
She shares her life with her 138 million Instagram followers and reportedly charges $1 million per sponsored post.
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Source: Business Insider
Jenner rose to fame on her family's reality TV show, "Keeping Up With The Kardashians." She was nine years old when the first episode was filmed.
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Source: The Hollywood Reporter
Jenner launched her first makeup product, the Kylie Lip Kit, in 2015.
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Source: Forbes
Jenner owns multiple luxury cars, which are likely worth millions collectively.
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Source: Business Insider
Jenner stores her cars in her 1.4-acre Hidden Hills compound, which she purchased in 2016 for $12 million.
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The world's second- and third-youngest billionaires are sisters Alexandra (right) and Katharina (left) Andresen.
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Source: Forbes
Both Alexandra and Katharina have a net worth of $1.4 billion.
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Source: Forbes
They each own 42.2% of Oslo-based investment company Ferd, which their father Johan H. Andresen founded.
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Source: Money
Alexandra, 22, is a keen horse rider and has at least four horses.
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Source: Instagram
She rides competitively and is sponsored by equestrian brands Kingsland and Samshield.
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Source: Instagram
She makes sure her "boys" are kept in the best shape with plenty of veterinary and grooming appointments.
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Source: Instagram
She was a part of Norway's dressage team ...
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Source: Instagram
... and like many 22-year-olds, she appears to enjoy getting glammed up and going out with friends.
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Source: Instagram
But it's not all ponies and sky-high martinis. If her Instagram feed is any indication, Alexandra also loves the outdoors, hiking, camping, and fishing.
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Source: Instagram
Alexandra is a self-proclaimed jet-setter. In a photo dated December 2016, she's pictured in Mumbai, India.
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Source: Instagram
Alexandra and her 23-year-old sister Katharina have five dogs between them, including a purebred boxer and bulldog.
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Source: Instagram
Before Alexandra moved to Florida in 2018, both sisters lived at home with their father and mother, pictured here with Katharina.
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Source: Money
When their father transferred most of his funds to his daughters in 2005, the money was split equally between Alexandra and Katharina (pictured here).
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Source: Money
Older sister Katharina, 23, is also a horse-riding fan, but less so than her younger sister.
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Source: Instagram
Katharina enjoys staying up to date with the latest fashion trends, and favors a Louis Vuitton bag. This one's value is estimated at $1,900.
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Source: Louis Vuitton
Another from her collection, this holiday-ready Louis Vuitton duffel, is valued at $1,870.
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Source: Louis Vuitton
Katharina is a self-proclaimed "shoe-aholic." These limited-edition Louboutin pumps have an estimated value of $640.
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Source: Christian Louboutin
These pearl-encrusted, heeled Gucci loafers — also from her collection — will cost you $990.
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Source: Gucci
The older Andresen sister bought her first Rolex in 2017, worth nearly $9,000.
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Source: Rolex
But her pride and joy is her bulldog, Tycho.
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Source: Instagram
Just behind the Andresen sisters is Gustav Magnar Witzøe, who is also among Norway's super-rich and is the fourth-youngest billionaire in the world.
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Source: Forbes
This 26-year-old is worth $3 billion and owns 47% of Norwegian salmon producer Salmar, which was gifted to him in 2013 by his dad Gustav Witzoe, pictured here. He's the wealthiest billionaire on this list.
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Source: Forbes
Gustav (also known as Gus) is into fashion — especially shoes. He often features in the front row of various Norwegian fashion shows.
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Source: Instagram
He's a model with Next Models Worldwide.
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Source: Instagram
And judging by his Instagram feed, he likes to travel. Here he is in Paris in July 2017 ...
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Source: Instagram
... and in Padangtegal, Indonesia, in April 2017.
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Source: Instagram
Witzøe has at least one full sleeve of tattoos.
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Source: Instagram
He's gotten top-notch seats at sold-out concerts like this 2016 Coldplay show ...
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Source: Instagram
... and, judging by social media posts, enjoys active hobbies, including golfing, skiing, and Jet Skiing.
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Source: Instagram
Like the Andresen sisters, Witzøe also has a pet dog: His blue Staffordshire bull terrier features heavily on his Instagram.
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Source: Instagram
John Collison is the fifth-youngest billionaire and the second-youngest self-made billionaire in the world.
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Source: Forbes
The 28-year-old Irish entrepreneur founded payment company Stripe with his brother in 2010, which went on to make the pair both billionaires in their own right after a deal in 2016. John is now worth an estimated $2.1 billion.
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Source: Forbes
Collison was studying his undergraduate degree at Harvard when he and his brother launched the company, but he quickly dropped out after Stripe gained momentum. Now, his days are spent pursuing hobbies and things on his bucket list, like flying across the Atlantic.
https://twitter.com/mims/statuses/879069948932497408
Completed a bucket list item this weekend: flying a small plane across the Atlantic! 27 hours of flying over 3 days. Didn't even get wet. pic.twitter.com/Ph6Yl2rv9F
Source: Forbes
He also enjoys partaking in fun runs ...
https://twitter.com/mims/statuses/727279538258976769
Got my result: I beat the index, finishing 13th overall at 19:09 (6:10/mile). New PR! pic.twitter.com/nor4mdSbYS
Source: Twitter
... and long-distance treks and pursuits, sometimes dragging the whole Stripe office along with him.
https://twitter.com/mims/statuses/805598279010426880
13 Stripes got up at 5am this morning to catch sunrise (and eat pancakes) atom Mt Tam. Worth it! 🌅🏃🏼 pic.twitter.com/s4QhqNIT06
Source: Twitter
Despite his technological genius and adventurous lifestyle, Collison still seems to be amused and amazed by the little things in life, like this coffee cup sporting a "pocket cookie."
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It's 2017. We have the technology. There's no excuse for every coffee cup not to have a pocket cookie. pic.twitter.com/3dPutVLEox
Source: Twitter