When it comes to our beauty routine, we tend to be obsessed with skincare products that promise to make us look younger. But there is one often forgotten step in your regimen that could be making you look older. When we age, our hair gets thinner, so it follows that maintaining full and voluminous locks will keep you looking youthful into your golden years. Luckily, the beauty junkies at Sephora are just as passionate about hair as they are makeup. Here, scroll through the beauty mecca’s five best-selling shampoos—the number one product is guaranteed to keep your tresses looking youthful.