India, June 8 -- At 30, Lucy Guo has dethroned Taylor Swift as the world's youngest self-made billionaire. Despite her staggering net worth - Forbes estimates it to be $1.3 billion - this 30-year-old college dropout does not believe in wasting money.

In fact, Lucy tells Fortune that her wardrobe is dominated by free clothes or fast fashion - barring the odd designer dress. She still drives a Honda Civic and flies commercial.

"I don't like wasting money," the 30-year-old told Fortune.

Lucy Guo is an American social media influencer and co-founder of Scale AI. She founded the company in 2016 and was fired two years later following a disagreement with co-founder and CEO Alexandr Wang.

Lucy was just 21 when she launched the AI startup. A ...