Hot Business News Today 'I'm Frugal': This 30-Year-Old Billionaire Says Life 'Hasn't Really Changed That Much' After Making Billions. Here's Where She Spends Money. by Sherin Shibu • August 28, 2025 • 0 Comments The world’s youngest female billionaire, Lucy Guo, made her fortune from a startup she co-founded called Scale AI. Read more...