When we reach our late 60s or older, why does the color of our hair change from a natural color like brown to white or

Question: When we reach our late 60s or older, why does the color of our hair change from a natural color like brown to white or grey?
- Keywords:
  grey,
  hair age
Asked by to Iain on 21 Mar 2014. This question was also asked by .
- Iain Moal answered on 21 Mar 2014:
  
  Well, I’ve started getting a few grey hairs already, even though I’m not even 30 yet! The reason people go grey is because, in our hair follicles, we have cells called melanocytes which produce the pigment that gives our hair its colour. However, these get less efficient when we get older, and eventually die without being replaced, which means that the follicles can’t add colour to our hair.

Question: When we reach our late 60s or older, why does the color of our hair change from a natural color like brown to white or grey?