If you have these lines on your nails after 40, it is a clear sign that..

Why You May Notice Vertical Ridges on Your Nails After 40 — And What They Mean

As we age, our bodies go through countless subtle changes—some more noticeable than others. One surprising area where these shifts show up is our fingernails. For many people, especially after the age of 40, vertical ridges—also called longitudinal striations—start to appear. These lines typically run from the cuticle to the tip of the nail and are a common feature of aging.