my hair started going gray at 20 years gray hair in your 20s grey hair in s here s what you can do what causes grey hair at a young age pre gray hair what are the gray hair can return to its original pre gray hair causes and options what causes pre graying in hair what causes white hair at early age and grey hair at a young age worry no more white hair at a young age what causes pre greying of hair melanin for hair what role it plays