Sun protection is the most evidence-backed way to prevent wrinkles. UV radiation degrades collagen and elastin fibers in the dermis, accelerating aging years before it becomes visible on the surface. A consistent daily SPF habit addresses the cause, not just the symptoms.
Choose Broad-Spectrum SPF
Not all sunscreens protect equally. Broad-spectrum formulas block both UVA rays, which penetrate deeply and break down collagen, and UVB rays, which cause surface burns. SPF 50 is the preferred choice for daily use, offering meaningfully more protection than SPF 30 over a full day outdoors.
Look for a broad-spectrum, lightweight formula that layers well under makeup and doesn't leave a white cast or clog pores. Mineral and chemical filters both work well when applied generously and reapplied consistently.
Reapply Sunscreen Daily
A single morning application doesn't hold through a full day outdoors. Sunscreen holds for about two hours, so a formula applied at 7 a.m. offers little protection by mid-morning without a second pass. UV exposure accumulates even on overcast days or through car windows, where UVA passes through glass with little resistance. Reapply every couple of hours outdoors, and don't skip sunscreen in winter; UV doesn't disappear along with the warmth.
Avoid Peak UV Exposure
Between 10 a.m. and 4 p.m., UV intensity is at its highest. Shade, protective clothing, and a wide-brimmed hat meaningfully reduce cumulative damage. These aren't precautions reserved for beach days; ordinary commutes and lunch breaks outdoors add up over years.