As you age, thin vertical lines from the base to the tip of your nails—called vertical ridges or longitudinal striations—often become more noticeable. They’re usually harmless and “a normal part of aging,” caused by slower keratin production in the nail matrix.

**Why They Happen After 40:**
The most common reason is aging. As the body’s renewal process slows, nails may form unevenly. Dehydration also plays a role—“dry nails are more prone to ridges,” especially if exposed to soap and cleaning chemicals. Nutrient deficiencies (like biotin, iron, or zinc) can also weaken nails. Since the body absorbs nutrients less efficiently with age, these shortages are more common.

**When to Be Concerned:**
Although typically harmless, see a doctor if ridges appear with “changes in nail color,” thickening, pain, or swelling. These may point to fungal infections, trauma, thyroid issues, or even melanoma.

**How to Care for Aging Nails:**

* Moisturize hands and nails after washing
* Drink water regularly
* Eat foods rich in vitamins A, B, C, zinc, and iron
* Avoid aggressive manicures and harsh tools
* Talk to a doctor about biotin supplements

Most vertical ridges are just a sign of aging—but they can sometimes reveal more.