Why do we grow Gray Hairs with age?

@incus99 (1083)
Philippines
June 25, 2010 9:06am CST
I always wondered why some people have more gray hairs than others, some develop it younger than others while most people grow them with old age... Medical science have explained that the gray hairs that we grow are just the mere spillage of the gray mater of the neurodermis (Spine and Brain) which is expressed in outwardly in an exodermal appendage (Hairs).. well, this is just a theory, some dead people who are exhumed grows gray hairs post mortem (after death)even though their brains were dead for a long time already, the nails (also exodermal) can also grow post mortem. If the embryologic theory is true, how come we don't grow gray nails or gray skin with age? The hair on our head may be confluent with the gray mater of the brain, but the hairs in the armpits, chest and in the crural (genital) areas are not confluent with the neurderm but they do grow Gray hairs with age. Do you have a good theory about Gray Hairs? opinion perhaps?
2 responses
@mspitot (3824)
• Philippines
26 Jun 10
i don't really know but your discussion made me remember what a friend of my mother said once. she said that old people get really wealthy, they have gold (on their teeth), they have silver (gray hair), and they have stones and diamonds (kidney stones).
@amyson (3498)
• Philippines
25 Jun 10
i dont have any theory about it gray hair but others say its was by our genes.some younger people have already appearing gray hair and its genetics.second conclusion is that stress adds to gray hair and it said that gray hair comes also in ages because the hair lining changes characteristic it becomes brittle and scalp also dry,another is due to poor nutrition adds to it.