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8. Walter Zable
Walter Zable
Age: 94
Job title: President, CEO, Cubic Corp.

Truman was president when Zable founded the San Diego defense technology company in 1951. Zable, a college football Hall of Famer (he played for William and Mary), still works five days a week -- and has no plans to retire. Every morning he rides a stationary bike or uses weights in his home gym.

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Last updated October 24 2009: 8:22 AM ET
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