No. He was hot when he was young and just gets better and better.
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Mark Harmon wears the hairstyle he has for NCIS maybe because he prefers it to look that way. There is a rumor that he does wear a hairpiece, but it's not known if it is true or not.
In the episode "Jetlag", Gibbs shoves McGee out of the way of an approaching car. He gets hit, and suffers an injury. As a result, he must wear a sling.
mostly Carhartt
It is rumored that Harmon wears a hair piece, but he has never publicly admitted to doing so.
He really is bald.