I think this is true and i am live example. My hair started greying prematurely and with age, greying turned faster. So I have no solution other than dying. I am bit lazy and little kids so i am slow and kind of care less. Also, want to cut down dyes, So times i do not dye, i hear indirect comments from desi ladies who are mere acquaintance, taunts from desi too loud mouth friends/collegues (even male) & cousins and i can see women's or people eye or gaze stuck at my hair/head, hence again, i go back and dye. My parents - on video call, On white hair, why do not you dye, what have you done to yourself? With pesistent dying ,that happened to you. .....ha ha With in 1 week of dying, my whites start to appear and with in 2 week, they became 1 1/5 inch from roots which is clear clear visible. By 3rd week, it becomes terrible and show up in every picture. Because of that, i can not have many hair styles, i want to do.