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 are known as vertical or longitudinal nail ridges. They are usually a natural part of aging, similar to wrinkles in the skin or changes in hair texture. Nails evolve as the body matures.

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, leading to subtle ridges along the nail surface.

Dryness often makes these ridges more noticeable. As we age, nails retain less moisture, and frequent handwashing, cleaning products, or harsh soaps can strip away natural oils.

Lifestyle and internal factors may also play a role. Mild nutritional imbalances, especially involving nutrients that support nail health, can affect nail appearance over time.

Circulation changes can influence nail growth as well. Healthy blood flow delivers oxygen and nutrients to the nail matrix, and gradual shifts may subtly alter nail texture.