India, Feb. 18 -- According to Dr. David Sinclair, a professor of genetics at Harvard Medical School, the rate at which an individual's fingernails grow could offer insights into how long they might live and details about their biological aging process.
In his podcast Lifespan, Sinclair referenced a 1979 study where researchers attached tiny measuring tapes to the fingernails of 271 individuals and monitored their growth over several years.
The study found that the rate of fingernail growth declines by approximately 0.5 percent per year starting at the age of 30. This suggests that nail growth rate serves as a biological aging indicator-the faster the nails grow, the better the individual's biological age status.
"The linear nail growth ...