Girls, Shall I color my hair?

Ok. So I have ultra dark brown hair, but genetics are beginning to kick in. Yes, I am getting the dreaded G word (Gray Hair). A friend of mine told me that I should not color it because gray is in. I don't know. I have always been taught to not go gray and to maintain as much youthful appearance as possible. Is gray in? What should I do?

Girls, Shall I color my hair?
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