Was bill gates the richest man in the world
- How long was bill gates the richest man in the world
- How many years was bill gates the richest man in the world
- When did bill gates became the richest man in the world
- Was bill gates ever the richest man in the world
- What year was bill gates the richest man in the world
- How old was bill gates when he became the richest man in the world
- Is bill gates still the richest man in the world
- Who was the richest man in the world before bill gates