Many people are surprised to discover faint vertical lines running from the base of their fingernails to the tips. These lines, often called longitudinal nail ridges, tend to become more visible with age and are usually considered a normal part of the body’s natural aging process. Just as skin develops fine lines and hair texture changes over time, nails also undergo gradual transformations. In most cases, these ridges are harmless and simply reflect the way nail growth evolves through the years.The structure of each nail begins in the nail matrix, the area beneath the cuticle where keratin—the protein that forms nails—is produced. As people age, keratin production may become slightly less uniform, leading to subtle variations in the nail surface. Dryness can also make ridges appear more prominent. Frequent handwashing, exposure to cleaning products, seasonal weather changes, and reduced moisture retention can all contribute to a more textured appearance.