Odaily Planet Daily News According to a Legacy announcement, Zerebro co-founder Jeffy Yu passed away in May 2025 at the age of 22. It is reported that Jeffy was a tech enthusiast from a young age, entering Stanford University to study computer science at the age of 15. By 19, he was already working as a full-time software engineer in Santa Cruz. Two years later, he co-founded a company and scaled it to a valuation of 800 million dollars in less than six months.