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No. 6: Anne Cox ...Net Worth: $10.7 billion Source of Wealth: Cox Enterprises Age: 92 Overall Rank: 32
At age 92, Chambers continues to sit on the board of privately held Cox Enterprises, which owns cable company Cox Communications, the Cox Media Group of newspapers, TV and radio stations, the Manheim automobile auction and AutoTrader.com. Her father, James M. Cox (d.1957), founded the company in 1898.
The heiress is the daughter of Wal-Mart founder Sam Walton and a noted philanthropist. Last year, she opened Crystal Bridges Museum of American Art in the town of Bentonville, Ark., where Wal-Mart is headquartered.