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AAD.org talks about your hair and what you need to do to keep it looking good:

Although hair dyes are popular for women of all ages, women in their 40s may be more likely to turn to hair color as a way to camouflage gray hair that typically starts to appear at this age. Dr. Draelos explained that gray hair occurs when the pigment cells in the body stop producing pigments, which is a sign that the body's ability to produce pigment is decreasing.