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Changes in nail color (especially dark streaks or lines)
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Splitting, peeling, or thickening nails
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Pain, swelling, or inflammation around the nail
These may point to fungal infections, trauma, or—in rare cases—melanoma, a serious form of skin cancer that can appear under the nail.
If You Have These Lines on Your Nails After 40, It’s a Clear Sign That…

How to Care for Aging Nails
Here are some simple tips to reduce the appearance of ridges and keep your nails strong and healthy:
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Moisturize regularly with hand and nail cream, especially after washing your hands.
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Stay hydrated, since dry nails are more prone to ridges and breakage.
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Eat a nutrient-rich diet with vitamins A, C, B-complex, and minerals like zinc and iron.
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Use gentle nail care tools and avoid harsh manicures or over-filing.