I knew a French family with 3 very pretty daughters when I was 20 and all these girls, about my age, with the faces of Egyptian princesses turned white between 20 and 30. My dad who died 2 years ago at 89 had about 10 percent of white hair, all the rest (and there was not much of it ) was dark brown. I am in between. I'd guess 25% of my hair is grey/white now and two years ago I have decided not to colour anymore as I am a lazy person