Just like skin loses elasticity and hair turns gray, nails undergo structural changes over time. The production of keratin—the protein that forms nails—may slow down or become uneven, creating ridges.
Main Causes After Age 40
1. Natural Aging Process
The most common reason for vertical ridges is simply aging. As we get older, the body’s ability to regenerate skin cells slows down. The same happens to the nail matrix (the base of the nail), which may produce keratin unevenly, leading to ridges.
2. Dehydration of the Nail
With age, nails—like skin—tend to become drier. A lack of moisture makes nails more brittle and accentuates ridges. Frequent exposure to water, soap, and cleaning chemicals can worsen dryness.
3. Nutritional Deficiencies
Low levels of key nutrients such as biotin, iron, zinc, and magnesium can weaken nails and make ridges more pronounced. Because metabolism and nutrient absorption often decline with age, deficiencies are more common after 40.
4. Health Conditions
In some cases, vertical ridges may indicate underlying health issues, including poor circulation, thyroid imbalance, or rheumatoid arthritis. If you also notice fatigue, brittle hair, or skin changes, it’s worth speaking with a doctor.
