I and my sister have started getting white hair since very young age. My sister started getting it since she was 14 years old and I started getting it when I was 16 years old. My parents and grandparents got white hair only after crossing 30 or 40 years of age. So what are the reasons that we are getting this white hair and what is the cure for this problem? even though my sister has been trying so many treatments such as ayurvedic and applying henna, nothing seems to be working for her. Please suggest the right treatment.