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The melanin levels in hair, which give it the color you were born with, lower with age. This loss of melanin is what causes gray hair, or more precisely, the lack of any color in the hair. If you can remember grade school color charts, the grayscale was just used to determine the lighness of darkness of a picture - with no color. We can liken this example to gray hair because of the lack of melanin. When there is still color, it is always a particular combination of all three primary colors - red, blue, and yellow. When our bodies age and quit producing more melanin (the color molecule), the result is gray hair.

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Q: What causes hair to lose its luster at old age?
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