Why does grey hair grow at different rates?
As we age, our hair follicles naturally decrease in their productivity of melanocytes, cells located in the skin’s epidermis containing a pigment called melanin. As production decreases, the colour of our hair follows suit. This decolourisation occurs within the individual life cycle of each hair strand on our bodies. The reason these grey hairs may appear in different places and grow at different rates is based on where a single hair is in its life cycle. As one hair falls out, a new grey hair has a chance of replacing it. Each one of our hair follicles is at a different stage in the cycle, so all hair does not grow in unison.
Factors such as stress and inherited genetic traits can also contribute to when and where the greys begin to sprout.