Gray Hair: Causes and What Research Says About Prevention Can You Reverse Premature Grey Hair in Your Late 20s? Vogue Arabia Cause of grey hair may be 'stuck' cells, say scientists BBC News Finding grey hair in your 20s or 30s may not be just a matter of age or genetics; health experts indicate that nutritional deficiencies play a significant role in premature greying. Research Can You Prevent or Reverse Grey Hair? What the Science Says OMI Wellbeauty Reverse Gray Hair: 20 Nutrients, Vitamins, Supplements, Herbs, More