Ross Perot, 74
He has a few new gray hairs, but Perot hasn't slowed down. These days he spends more time with his pet cause - helping injured U.S. soldiers get special medical care - than with Perot Systems, where he's chairman emeritus. While he says he's not interested in politics anymore, Washington still frustrates him. "At one point, the Model A Ford looked great, right?" he says of Social Security. "But as times changed, engineers figured out ways to make it better. They don't do that in Washington, and that's sad."