Eddie Hill would be my best guess (retired 1999 at age 63)
Peston Welsh who's 84 as of 2009.
Per Wikipedia: Paul Newman, at the age of 70 years and 8 days, became the oldest driver to be part of a winning team in a major sanctioned race,
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The oldest driver by age who entered a Formula One race was Louis Chiron at the age of 55 years and 292 days in the 1955 Monaco Grand Prix