When it comes to preventing wrinkles, sagging skin, and dark spots, many people focus on expensive serums and trendy treatments. But according to dermatologists, one of the biggest causes of premature aging is something far more basic—and it’s a mistake millions of people make every day: skipping sunscreen.
Board-certified dermatologist Dr. Doris Day says failing to wear sunscreen consistently is one of the fastest ways to accelerate collagen loss, especially after age 30, when the body’s natural collagen production already begins to decline.
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Why SPF Matters More After 30
As we age, collagen—the protein responsible for keeping skin firm, smooth, and elastic—gradually breaks down. While this is a normal part of aging, exposure to ultraviolet (UV) rays dramatically speeds up the process.
UV radiation damages collagen fibers and elastin, weakens the skin’s support structure, and contributes to fine lines, wrinkles, uneven pigmentation, and loss of firmness. Over time, this process—known as photoaging—can make skin appear years older than it actually is.
That’s why Dr. Day considers sunscreen one of the most effective anti-aging products available.
“If you’re over 30 and you’re not using SPF every day and reapplying it, start now,” she says.
She adds that sunscreen is “the best anti-aging product you’re probably skipping.”
Don’t Forget Your Neck
While many people remember to apply sunscreen to their face, the neck is often overlooked—even though it’s one of the first places to reveal signs of aging.
Because the skin on the neck is thinner and more delicate, it is especially vulnerable to collagen loss and sun damage.
Dr. Day recommends extending your skincare routine below your jawline every morning.
“Of course, don’t forget your neck,” she says.
When applying skincare products, she also recommends using upward strokes.
“Always go in an upward direction so your neck looks good as well.”
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Make Sunscreen A Daily Habit
Dermatologists recommend choosing a broad-spectrum sunscreen with SPF 30 or higher every day—even when it's cloudy or you're spending most of your time indoors near windows.
Equally important is reapplying sunscreen every two hours when outdoors, especially after swimming or sweating.
While retinol, peptides, vitamin C, and professional treatments can all help improve the appearance of aging skin, experts agree that none of them can fully undo the collagen damage caused by repeated UV exposure.
The Bottom Line
If you're investing in anti-aging skincare but skipping sunscreen, you may be missing the product that matters most. According to Dr. Day, wearing SPF daily—and remembering your neck—can help protect collagen, slow visible signs of aging, and keep skin looking healthier for years to come.
