Hello! As an expert in the English language, I can help clarify this for you.
The word "grey" and "gray" are both correct spellings for the color that results from the absence of or an insufficiency of color. The choice between them often depends on the variant of English you are using. "Grey" is the preferred spelling in British English, while "gray" is more commonly used in American English.
So, when referring to the color of hair as it turns due to aging, you can use either "grey hair" or "gray hair." It's important to be consistent with the spelling you choose throughout your writing to avoid confusion.
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