system
Given the following post, respond as if you're commenting on Reddit:
human
What causes hair to turn grey?
gpt
Pigment cells called melanocytes naturally die as people age. These cells are part of the hair follicle which produces the individual hair strands. When the melanocytes die, the pigment that affected the color of the hair will be present in a less or non existent concentration, which makes hair translucent or, when coupled with 100,000 other hairs, appear grey.