The skin has long been treated as a cosmetic concern, but emerging science suggests it’s much more than that. As our largest organ, the skin serves as a critical barrier between us and the outside world, yet it also plays an active role in immune function, inflammation, and healthy aging. As skin ages, the accumulation of senescent cells and declining barrier integrity may contribute not only to wrinkles and visible aging, but also to the chronic, low-grade inflammation that underlies many age-related diseases.