Why does hair turn gray as people get older?
user
I think it has to do with the balance of different kinds of pigments and cells in hair follicles.
assistant
Right. The pigment cells in hair follicles gradually die so there are fewer pigment cells in a hair follicle. This decrease in melanin means that hair will become more gray, silver, or white as it grows.
user
That is interesting!
assistant
Why does hair turn gray as people get older?
user
I think it has to do with the balance of different kinds of pigments and cells in hair follicles.
assistant
Right. The pigment cells in hair follicles gradually die so there are fewer pigment cells in a hair follicle. This decrease in melanin means that hair will become more gray, silver, or white as it grows.
user
So the follicles make the pigment, and the pigment is why hair is usually brown or black. As people get older, they lose pigment and the pigment-making cells die, so their hair becomes gray or white.
assistant
Why does hair turn gray as people get older?