The 8 Hair Mistakes That Age You, According to Celebrity Stylists Assuming You Need to Go Shorter. ... Highlighting Your Hair to Cover Grays. ... Making an Extreme Color Change. ... Using One Color Formula to Cover Grays. ... Forgetting Hydration-Packed Products. ... Skimping on Supplements. ... Being Inconsistent With At-Home Touch-Ups. More items... May 29, 2020