My brothers DD is 13 and her hair is turning grey like all of it! She has always had very dark brown hair but in recent weeks it’s all going grey. I haven’t said anything or asked her as I feel she may well be self conscious of it as most of the time she either has a hat on it a bike helmet but I seen her right after school and then at a family gathering without any hats and her hair is indeed turning grey. Why would that be at such a young age? My DD is same age and has a lot of friends same age and iv never seen it before happening so young it’s not just like one little grey patch (my friends brother had a small grey patch when we were young) it’s literally her full head!