17 items in this article 1 item on sale! Photo-Illustration: The Strategist; Photos: Retailers Turning 50 is a major milestone for your skin. While your 30s and 40s may have been about protecting collagen and keeping the pores clean and blemish-free, your 50s is when your skin-care routine needs to be more reactive to the body’s natural processes. “The cell-renewal process slows down as we enter our 50s, leaving older, duller cells that stay on the skin’s surface longer,” says Dr. Dendy Engelman, a board-certified cosmetic dermatologist and Humphreys Witch Hazel committee member. Your 50s also bring lots of hormonal changes, which also affects the skin. This could be when…