Noticing thin vertical lines running from the base of your fingernails to the tips can be surprising, especially as they become more visible with age. Many people first notice them after 40, and in most cases, “they are completely normal.”

These lines, called vertical or longitudinal nail ridges, are usually a natural part of aging, similar to wrinkles or changes in hair texture. Fingernails are made of keratin, a protein produced in the nail matrix beneath the cuticle. Over time, “this production can slow or become less even,” creating subtle ridges.

Dryness often makes ridges more noticeable. Nails retain less moisture as we age, and frequent handwashing or harsh soaps can strip natural oils. Lifestyle and internal factors, such as mild nutritional imbalances, may also affect nail appearance. Circulation changes can influence growth, since “healthy blood flow delivers oxygen and nutrients to the nail matrix.”

Caring for nails is simple. Regular moisturizing of nails and cuticles helps, and wearing gloves during chores protects against chemicals and water.

Staying hydrated, eating a balanced diet, and filing nails gently all support healthier growth. While vertical ridges are usually harmless, “staying aware of changes in color, shape, or comfort helps you stay connected to your overall health.”