ON October 7, Intercontinental Exchange (the parent company of the New York Stock Exchange) invested $2 billion into Polymarket, pushing up the prediction market platform’s valuation to $9 billion. That made Polymarket’s 27-year-old founder, Shayne Coplan, the world’s youngest self-made billionaire. His reign was short: 20 days later, he was overtaken by the three cofounders of AI startup Mercor. That trio of 22-year-olds became the youngest self-made billionaires ever, gaining 10-figure status even earlier than Mark Zuckerberg did 17 years ago at age 23. “It’s definitely crazy,” Mercor’s Foody told Forbes in October. “It feels very surreal. Obviously beyond our wildest imaginations, insofar as anything that we could have anticipated two years ago.”

Then, in a remarkable stretch from November until December, another seven entrepreneurs under the age of 30 became billionaires, including Kalshi cofounder and former ballerina from Brazil Luana Lopes Lara, 29—now the youngest self-made woman billionaire on Earth and the only self-made woman billionaire in her 20s. (She turns 30 in May.) That means there are now a record 13 self-made billionaires under 30.

For all the hand-wringing about artificial intelligence killing off entry-level jobs, it’s creating something else at mind-blowing speed: billionaires barely old enough to rent a car. Industries and innovations that didn’t meaningfully exist a decade ago, including prediction markets and AI, now mint entrepreneurs with three-comma fortunes with astonishing speed. The last time Forbes counted anywhere close to this many young self-made billionaires was in 2022, when there were just seven self-made billionaires under age 30.

Back in April when........

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