These individuals are also known as
gray hairs or
no hairs:

"But in 2001, an 'old school' emphasis on improving the efficiency of operations and locating customers with deep pockets is back in vogue, and a tech company's investors breathe a sigh of relief when a 'gray hair' (or a 'no hair') CEO is in charge."
Scott Kirsner, "Downturn dictionary," The Boston Globe, November 12, 2001
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