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

they deserve professional attention because infections, inflammatory conditions, circulation issues, thyroid problems, or—rarely—skin cancers beneath the nail can sometimes appear this way.

For ordinary age-related ridges, gentle care is usually enough:

Moisturize hands and nails regularly
Avoid overly harsh manicures or aggressive buffing
Wear gloves continue reading …