Because the damage is cumulative and recovery is slower. Ultraviolet radiation is responsible for a significant portion of visible facial aging – the Skin Cancer Foundation estimates up to 80 percent of visible facial aging is attributable to UV exposure. Every day without sunscreen adds to decades of accumulated UV damage. For mature skin, this is compounded by the fact that thinner skin repairs more slowly, new dark spots appear more easily after sun exposure, and existing hyperpigmentation worsens without consistent protection. SPF 30 is the minimum. SPF 50 is worth it if you spend any time outdoors. Apply every morning, regardless of weather.
