In Your 20s: Prevent
From coloring to keratin, this is when most women start really experimenting with their hair—and with this comes the very first signs of aging. To prevent lasting damage, you'll need to invest in the best for your daily styling routine, from shampoo and conditioner to your blow-dryer.
"To prevent hair damage it's important to use the right products," says Perez. "Shampoo and conditioner should be sulfate free and contain dimethicone. Styling tools should have a ceramic system and ionic generator to protect strands from root to tip."
Try: Rowenta Infini Pro Dryer, $159.99; Ulta.com
Pictured: Blake Lively