If you’ve noticed thin vertical ridges running from the base to the tip of your fingernails after turning 40, you’re not alone. These common lines, known as longitudinal striations, are often just another sign of your body’s natural aging process – much like fine wrinkles or graying hair.

As we get older, our nail matrix (the hidden part beneath the cuticle where new nail cells form) slows down its production. This gradual change can lead to uneven keratin growth, creating those visible ridges. While usually harmless, these lines can sometimes hint at underlying health issues worth paying attention to.