Why do peoples hair turn grey when thier old

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 become a more transparent color — like grey, silver, or white — as it grows. As people continue to get older, fewer pigment cells will be around to produce melanin. Eventually, the hair will look completely grey.

the answer is true because it was true

9, 5, 10000000 ( that is supposed to be a ten for the last one)