Company: Rockmount Ranch Wear
Location: Denver
Founded: 1946
Employees: Undisclosed
Revenue: Undisclosed

At 106 years old, Weil is believed to be the oldest CEO in the United States. He is also considered an icon in the western wear industry. Weil, who founded Rockmount in 1946 and spends his mornings greeting customers at his retail store in Denver, is known around the world for designing the first western shirts with snaps, and for being the first to produce bolo ties commercially. The Rockmount brand has been popularized by dozens of celebrities over the years -- from Elvis Presley and Bruce Springsteen, to Ronald Reagan and Robert Redford -- and was used as the wardrobe for the actors of Brokeback Mountain.