Mark Zuckerberg was 23 years old when he became a billionaire in 2008, making him the youngest self-made billionaire in the world at the time, according to Forbes and Britannica. He achieved this status after launching Facebook from his Harvard dorm room in 2004, with his wealth estimated based on the company's valuation.
Zuckerberg took the company public in May 2012 with majority shares. He became the world's youngest self-made billionaire in 2008, at age 23, and has consistently ranked among the world's wealthiest individuals. According to Forbes, Zuckerberg's estimated net worth stood at US$220 billion as of December 2025.
Breaking Records in Youthful Silicon Valley. At 22, Mercor's founders beat Mark Zuckerberg, who became a billionaire at 23, to set a new record for youngest self-made tech billionaire.
Meet the richest young millionaire in Nigeria : Nigerian pre-teen, Muhammed Awal Mustapha, aka Mompha Junior, is being dubbed the 'world's youngest billionaire' at just 10 years old. He's the only son of wealthy internet celebrity, Ismailia Mustapha, aka Mompha Senior.
Kim Kardashian just pulled ahead of Taylor Swift in terms of net worth — and she did it with her shapewear brand. According to Forbes, the business mogul's fortune has climbed to an estimated $1.9 billion, officially surpassing Taylor Swift's recently reported 1.6 billion net worth.
If Elon Musk is the world's first trillionare before Jan 1, 2030 then the market resolves to Yes. Outcome verified from Forbes.
A pioneer of the microcomputer revolution of the 1970s and 1980s, he co-founded the software company Microsoft in 1975 with his childhood friend Paul Allen. Following Microsoft's 1986 initial public offering, Gates became the world's then-youngest billionaire in 1987, at age 31.
Googlers call Zuckerberg's approach the 80 percent rule
She calls this idea the 80 percent rule. It states you should schedule only about 80 percent of your days. Leave 20 percent open to absorb whatever craziness comes up.
Jeff Bezos
Bezos, founder of Amazon, became a billionaire in 1999 at age 35 as the value of his company shares surged. In 2020, he became the first person ever worth $200 billion.
Lucy Guo. Lucy Guo is an American entrepreneur and engineer who co-founded Scale AI. In 2022, she founded her second start-up, known as Passes. As of 2025, Guo is the world's youngest female self-made billionaire, due to her stake in Scale AI.
Estimated Net Worth in 2024: £3.9 billion
Eight-year-old Charlotte is the wealthiest royal grandchild and the richest child in the world, with an estimated net worth of £3.9 billion ($5 billion).
Many of the world's billionaires are far older than the tech-founder stereotype. At 103 years old, George Joseph is still actively involved in his company, Mercury General. In fact, young billionaires (under age 50) make up just 10% of the global billionaire population.
When measured by nominal GDP, the United States remains the richest country in the world, generating over $27 trillion in economic output in 2025. Its strength lies in a highly diversified economy, spanning finance, technology, manufacturing, and services.
Oprah herself became a millionaire by age 32, and her annual paychecks blossomed to $30 million by the end of the decade. By age 49, she had become a billionaire.
Bill Gates could have been the world's first trillionaire if he hadn't sold his Microsoft shares and dedicated billions to philanthropy. Forbes estimates his stake, adjusted for splits, would be worth $1.4 trillion, plus $100 billion in dividends.
Elon Musk. Elon Musk, the CEO of Tesla and chairman of X (formerly known as Twitter), revealed during a guest appearance on Saturday Night Live in 2021 that he has Asperger's syndrome.
June 7. In a morning interview with NBC News on June 7, Trump stated that he did not wish to reconcile with Musk, and added that Musk would face 'very serious consequences' if he funded Democrats. Trump also mentioned having saved Musk's life during his first administration.
Oprah Winfrey - $3.1 billion 2. Kim Kardashian - $1.7 billion 3. Taylor Swift - $1.6 billion 4.