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I am not sure if I ever saw a monkey or a bird age and lose hair pigment as it grows. It maybe due to my lack of information. But it appears to be a general presumption that only humans age and lose hair pigment (hence developing grey hair).

If this is true, then I am curious why only humans?

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I don't think it is restricted to humans. Dogs lose hair pigment as well, usually around the muzzle. This work used graying of hair to discriminate senior dogs. I don't know which other mammals lose hair pigment, though, nor why.

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  • $\begingroup$ We also see this in big apes. $\endgroup$ – Chris Apr 28 at 7:42

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