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You will until you get old then it will turn gray like the hair on your head although not necessarily at the same rate. That could have something to do with exposure to sunlight.
its a genetic thing so some where down the line in your family someonehad red hair and thats where you get it so yes you will have it always
More than likely but if you are not happy with it then there are safe pubic hair dyes that people can use but check with a doctor first because you could have a skin condition or allergy that will affect you if you ever decide to use some. xxx :)