Have you ever wondered why your grandmother has grey hair? To understand the reason, let us look at a single strand of hair. It is made up of two parts- the root which lies below our scalp, and the shaft- that is the part you see- which grow above the scalp. The root of every strand of hair is surrounded by a bulb shaped structure called the hair follicle. Each hair follicle contains a certain number of pigment cells.
These pigment cells continuously produce a chemical called melanin, which gives the growing shaft of hair its colour.
As we get older, the pigment cells in our hair follicles gradually die. When there are fewer pigment cells in a hair follicle, that strand of hair will no longer contain as much melanin, and will lose its colour. It will become gray, silver, or white, as it grows. Most of us will start having gray hair around the same age that our parents or grandparents first did…so you still have plenty of time left before you start getting grey hair!