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Kirk Kerkorian
91

How'd he get so rich? Activist investor Kerkorian may be 91, but he is showing no signs of slowing down. With a fortune estimated at around $5 billion, Kerkorian got his start in the airline business after World War II. From there he moved into the casino and film businesses, buying and selling MGM Studios three times. His private investment corporation Tracinda is majority owner of the MGM Mirage resort in Las Vegas and has at various times also owned large stakes in General Motors, Chrysler, and Ford.

Learn more about MGM Mirage (MGM.)