Australia's youngest billionaires and how they got rich

But how they made their fortune could not be more different.

New research from City Index probed the Forbes' list of the world's billionaires to find the youngest Aussies on the list.

None are as young as the world's youngest billionaires aged 19, Italy's Clemente Del Vecchio ($6.1 billion) and South Korean Kim Jung-youn ($2 billion) - who gained significant inheritances.

Here's how Australia's young and wealthy they made their billions.

Canva co-founders Melanie Perkins, 36, her husband Cliff Obrecht, 37, and their collaborator Cameron Adams, 43, all rank in the top 10 youngest Australian billionaires.

With a net worth of $5.6 billion Ms Perkins is the nation's youngest alongside Ginia Rinehart, according to Forbes.

Canva, the free content creation platform, was the brainchild of Ms Perkins who hails from Western Australia and is CEO of the company.

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The four children of mining magnate and Australia's wealthiest person Gina Rinehart are some of the nation's youngest billionaires.

Ginia Rinehart, 36, Hope Welker, 37, Bianca Rinehart, 46, and John Hancock, 47, each have a net worth of $3.1 billion.

The siblings are the only billionaires in the list of 10 who are not self-made.

The 43-year-old co-founders and co-CEOs of Atlassian are the wealthiest of Australia's youngest billionaires.

Mike Cannon-Brookes, $18 billion, and Scott Farquhar, $17.5 billion, created the Sydney-based software company as college friends in 2002.

Coming in at 10^th spot is 52-year-old Nigel Austin, the founder and majority owner of Cotton On Group.

Mr Austin started selling denim jackets from his car boot at a Geelong market in 1988 before opening the first Cotton On store in 1991.

He is the son of Garry Austin who founded the Austin Group with clothing brands GAZMAN, Cable and Perri Cutten.