My 9 yrs old daughter is having loads of grey hair.. We have done all her tests, thyroid, B12, iron, ferritin.. All are normal. Only Vit D is showing low for which How to go grey and still look like you've made an effort What Causes Grey Hair: 5 Ways to Reduce it hair buddha Going Gray Guide: What NOT to Do While Going Gray Naturally The amount of grey hair I got during my PhD (left) and 7 months after my defense (right) : r PhD