If wrinkles appear on your nails after 40 years of age, this could be a warning sign...
2. Drying out the nail
As we age, nails – like skin – tend to become drier. Lack of moisture makes nails more brittle and accentuates ridges. Frequent contact with water, soap and cleaning chemicals can worsen dryness.

3. Nutritional deficiencies
Low levels of key nutrients like biotin, iron, zinc, and magnesium can weaken nails and make ridges more prominent. Since metabolism and nutrient absorption often slow with age, deficiencies are more common after age 40.
4. Health status
In some cases, vertical lines can indicate underlying health issues, including poor circulation, thyroid imbalances, or rheumatoid arthritis. If you also notice fatigue, brittle hair, or skin changes, it's worth speaking to a doctor.
When should you start worrying?
Vertical grooves are usually harmless, but you should see a doctor if you notice the following:
-
Changes in nail color (especially dark streaks or lines)
-
Splitting, peeling, or thickened nails
-
Pain, swelling, or inflammation around the nail
These may indicate fungal infections, trauma or – in rare cases – melanoma, a serious form of skin cancer that can occur under the nail.