We know that aging is inevitable, so it’s important to seek out the best skin-care products to promote healthy, natural aging. And with so many “antiaging” skin-care products making claims they can’t back up, it can be difficult to diffuse what has effective marketing versus what’s actually effective. Before we dive in, take a look at the science and derm-recommended ingredients you should be looking for when it comes to aging skin.When does your skin start aging?Age-related skin changes start earlier than you might think: at around age 25, when your skin starts producing less and less collagen. This is why your skin-care routine in your 30s will look different. By the time we’re 50, there’s almost no new collagen being made and the collagen that does remain breaks down, becoming fragmented, and weaker, Shari Marchbein, M.D., professor of clinical dermatology at NYU School of Medicine who practices at Downtown Dermatology in Manhattan, tells SELF. This concept is known as intrinsic agi...