Your chronological age can often differ from your biological age. Biological age is determined by observing the proper functioning of your body’s tissues and cells. This is clearly visible in the speed of nail growth. The doctor said he pays particular attention to the slowing of his nails’ growth and notes how long it has been since he last trimmed them. He referenced a specific study conducted in 1979 in which scientists observed the nail growth rate of hundreds of people. They found that the participants’ nail growth rate slowed by 0.5% per year starting at age 30. This suggests that if your nails grow faster than this expected rate, you are aging at a slower-than-average rate.

Other health signs revealed by nails

Your nails can reveal much more than your biological age. There are several health conditions that can alter the appearance of your nails. For example, a dark streak on a nail could indicate the development of melanoma. Nails with numerous small indentations could be a symptom of psoriasis or atopic dermatitis. Yellowing of the nails can be a sign of rheumatoid arthritis or lung disease. Club-shaped or curved nails could indicate health problems affecting the heart, lungs, liver, and stomach. White nails could reveal the presence of diabetes or liver disease, while pale nails could be a symptom of anemia. Finally, blue nails could indicate a lack of oxygen in the blood.

Sometimes it’s simply a nail-related condition.

While the condition of your nails can reveal a lot about your overall health, sometimes the problem is limited to your fingernails. Brittle nails can be caused by constant wetting and drying. They could also be a sign of iron deficiency or hypothyroidism. Certain lotions, such as those containing lanolin or alpha-hydroxy acids, can help counteract brittle nails. Nails can also become brittle due to removing nail polish or prolonged immersion in soapy water. Furthermore, brittleness could be due to external factors. If you’re unsure whether the brittleness is caused by external or internal factors, simply observe whether your toenails are also brittle. If internal factors are the cause, you can try increasing your intake of iron-rich foods or taking supplements.