Zach Yadegari, based in Miami, achieved two successful startup exits before age 20, selling a gaming site for $100,000 and an AI calorie tracker acquired by MyFitnessPal. He is now launching his third venture, Flow, a physical tech product focused on health and productivity, aiming for another billion-dollar business.

MyFitnessPal acquired Cal AI, an AI-powered calorie-tracking app that 19-year-old Zach Yadegari cofounded while he was in high school, last year.

Zach Yadegari, based in Miami, achieved two successful startup exits before age 20, selling a gaming site for $100,000 and an AI calorie tracker acquired by MyFitnessPal. He is…