8) Elizabeth Holmes (Age: 31; Net worth: $4.5 billion)
Elizabeth Holmes is the youngest self-made woman billionaire. She is the founder of Theranos, a blood testing and health technology company. She founded the company in 2003 with money she had saved for college.
7) Anton Kathrein, Jr. (Age: 30; Net worth: $1.7 billion)
Anton Kathrein, Jr. is the third generation to lead Kathrein-Werke, a company which has become a key player in mobile communications as service providers have expanded their networks to accommodate rapid growth in data traffic in recent years.
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