If he spent $1 million a day, it would take him 245 years to spend his fortune.

Here's how he made all that cash.

In 1975, Gates cofounded Microsoft.

Twelve years later, he became the world's youngest billionaire at the time.

He later released Windows 95, and became the world's richest man.

He's been at the top of the list ever since.

Gates is also a leading philanthropist.

He stepped down as Microsoft CEO to focus on the Bill & Melinda Gates Foundation.

The foundation has given away $41.3 biilion to charity.

Gates doesn't to forget to splurge on himself, though.

He bought a $21 million jet in 1997.

He's had tons of luxurious cars over the years.

He even once got arrested for speeding in a Porsche 911.

Gates had an extensive art collection.

In 1988, he spent $36 million on this Winslow Homer painting.

That piece hangs in his $63 million home near Seattle.

It has 24 bathrooms, 6 kitchens, a reception hall that holds 200 people,

and a artificial stream stocked with fish.

In 2010, Bill, Melinda, and Warren Buffett created “The Giving Pledge.”

Those who join pledge to give half of their wealth to charity.