Can Your Fingernails Predict Your Lifespan? Longevity Expert Says Maybe

A leading longevity expert suggests that the rate of fingernail growth could be an indicator of biological age and potentially lifespan. Dr. David Sinclair, a genetics expert from Harvard Medical School, explained on his podcast “Lifespan” that nail growth reflects the body’s ability to generate new, healthy cells. Faster nail growth may suggest a slower rate of biological aging.

Dr. Sinclair cited a 1979 study that tracked fingernail growth over years, finding a 0.5% annual decrease after age 30. He suggests that faster nail growth than average for your age might indicate slower-than-average aging. He personally monitors his own nail growth, considering it a potential marker of his biological age.

Nail growth can be affected by factors like blood circulation, diet, and hormones. Slowed circulation with age can reduce nutrient delivery to nails, while deficiencies and hormonal changes (like puberty or pregnancy) can also impact growth.

Fingernail appearance can also reveal health issues. While ridges are common with aging, they can also signal problems in younger individuals. White spots, red lines, and ridges can indicate deficiencies or health conditions. Black spots can be a sign of melanoma, while clubbing (widening and wrapping of nails) can be linked to serious heart or lung conditions.

It’s important to note that while Dr. Sinclair is a respected expert, he was previously criticized for promoting an “unscientific” anti-aging pill for dogs, leading to resignations from his founded research body.