Out of 13 SNPs included in our predictive models for hair greying, 6 (FGF5 rs7680591, RUNX1 rs68088846, IRF4 rs12203592, BRINP1 rs2416699, TEX41 rs10928235, GRID1 rs2814331) were previously associated with male pattern baldness (MPB) [17, 21, 53, 54]. The gene discussed is IRF4; the disease is androgenetic alopecia.