1. Alice Walton - Net worth: $69.7 billion - Rank in world: #18 - Source of wealth: Walmart - Age: 72 The only daughter of Walmart founder Sam Walton, Alice Walton inherited a huge portion of the company upon her father’s death in 1992. A member of the richest non-royal family in the world, Walton has spent very little time working for the family business, instead focusing on curating artwork. In 2011, she opened her own art museum in Arkansas, the Crystal Bridges Museum of American Art, which features works from greats like Warhol, Rockwell, and Rothko. 2. Julia Koch - Net worth: $62.9 billion - Rank in world: #21 - Source of wealth: Koch Industries - Age: 60 Julia Koch inherited a 42% stake in Koch Industries when her husband, David Koch, died in 2019. The duo met on a blind date in 1991 and married in 1996. The former fashion assistant and her late husband donated a total of $1.2 billion, including $10 million to both the Mount Sinai Medical Center and the Stanford Children’s Medi