The world’s 10 richest couples have an aggregate net worth of some $510 billion, according to Wealth-X, a provider of wealth data.

The couples are based on three continents, and range in age from their early 30s to mid-80s.

Four couples on the Wealth-X list came by their wealth through inheritance, while the rest are self-made, building their fortunes through technology, investing, real estate and retail.

Last year, Wealth-X reported that ultra-high-net-worth individuals accounted for 0.004% of the global adult population, but control nearly 12.8% of the world’s total wealth.

Following are Wealth-X’s list of the world’s 10 wealthiest couples.

James Walton and his wife, Lynne.

10. James and Lynne Walton

Combined net worth: $36.2 billion

Country: U.S.

Wealth source: Inheritance

Mark Zuckerberg, and his wife, Priscilla Chan (Photo: AP)

9. Mark Zuckerberg and Priscilla Chan

Combined net worth: $38.5 billion

Country: U.S.

Wealth source: Self-made 

Bernard Arnault, and his wife, Helene Mercier. (Photo: AP)

8. Bernard Arnault and Helene Mercier

Combined net worth: $38.7 billion

Country: France

Wealth source: Inheritance

Jeff Bezos, and his wife, Mackenzie. (Photo: AP)

7. Jeff and Mackenzie Bezos

Combined net worth: $39.8 billion

Country: U.S.

Wealth source: Self-made 

Wang Jianlin, Chairman of the Dalian Wanda Group. (Photo: AP)

6. Wang Jianlin and Lin Ning

Combined net worth: $40.7 billion

Country: China

Wealth source: Self-made

Charles Koch (Photo: AP)

5. Charles and Elizabeth Koch

Combined net worth: $47.4 billion

Country: U.S.

Wealth source: Inheritance

David Koch and his wife Julia. (Photo: AP)

4. David and Julia Koch

Combined net worth: $47.5 billion

Country: U.S.

Wealth source: Inheritance 

Warren Buffett and his wife Astrid Menks. (Photo: AP)

3. Warren Bufffet and Astrid Menks

Combined net worth: $65 billion

Country: U.S.

Wealth source: Self-made

Amancio Ortega Gaona, founder and chairman of Zara.

2. Amancio Ortega Gaona and Flora Pérez

Combined net worth: $70.7 billion

Country: Spain

Wealth source: Self-made

Bill Gates and his wife Melinda. (Photo: AP)

1. Bill and Melinda Gates

Combined net worth: $85.7 billion

Country: U.S.

Wealth source: Self-made

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