By now, we consider ourselves well versed in all the various steps and facets of anti-aging skincare. We understand that retinol helps fight wrinkles, vitamin c brightens, and hyaluronic acid hydrates and hides the fact that we're hungover as hell. But what about anti-aging hair care? Because—surprise—your hair is getting older, too. As you age, not only do the number of hairs on your head decrease, but the diameter of each strand shrinks, too. The result? Thin, sad, lifeless hair. And if this applies to you, you're not alone—40% of women have visible hair loss by the time they're 40, according to the American Academy of Dermatology. So, while you've been investing in snail serum and bee venom moisturizer for your skin, you've been totally neglecting another part of your body that needs some anti-aging love. Luckily, a new crop of high-tech products on the market are specially formulated to repair, thicken, and revitalize—basically, your hair's version of plumping, brightening, and wrinkle-smoothing. From a rejuvenating scalp serum with apple stem cells to a miracle repairer that works while you sleep, keep scrolling to see them all!