The most commonly cited number in skincare is also the most important one to act on: roughly 80 percent of visible skin aging is caused by sun exposure, a phenomenon called photoaging. Wrinkles, sagging, dark spots, and rough texture are not simply the result of passing birthdays, but the accumulated effect of ultraviolet light breaking down the skin’s structure over decades.The mechanism is ultraviolet damage to collagen and elastin. UVA rays penetrate deep into the skin and generate free radicals that degrade the collagen fibers that keep skin firm, while UVB burns the surface and drives pigment changes. Over years, this repeated damage causes the skin to lose its scaffolding, which is why sun-exposed areas like the face and hands age far faster than protected areas like the inner arm.The evidence is stark and visual. Studies comparing identical twins, and images of truck drivers with far more damage on their window-facing side, show that the skin exposed to sun ages dramatically faster than the skin kept covered.
The 80 percent figure comes from research attributing the majority of visible aging to ultraviolet exposure rather than to
Leave a Reply