4. JUDY LOVE

$5.2 billion  SOURCE: Retail, gas stations AGE: 84 • RESIDENCE: Oklahoma City SELF-MADE SCORE:  She and her husband, Tom, started truckstop chain Love’s Travel Stops & Country Stores in 1964. The two ran the company until 1975, when Judy returned to college to complete her interior-design degree. The $20 billion (estimated revenue) business, which is run by two of her children, opened 38 stores in 2020 and another 20 in the first six months of 2021.