It's funny, my hair is much thicker and longer than it was when I was a little girl. I started to go grey at the side of my temples when I was 26 (which was 17 years ago). I think, because I am taking better care of my hair, and my eating habits have changed and so has my hair. Once you look after yourself and hair instead, your hair may go white or not, as for thickness, that depends, my mother was prone to be thin in the top of her scalp, but she always parted her hair in the middle, plus I think it was how her hair grew, after she started putting castor oil, there it soon thickened up and when she died at the age of 72, she had thick white near bra length hair. My grandmother who died at 98 with thick black hair, my great aunt also had thick black hair. Also I have noticed that the hair on my temple are growing out white, so I can see myself with white hair, but as long as it is thick and waist length, I don't care.