US scientists believe they may have uncovered why hair turns grey as we age, citing pigment-making cells which lose the ability to mature.
The arrested development impacts immature cells which would otherwise have developed into melanocytes which give hair its natural colour or shade.
Cause of grey hair may be '''stuck''' cells, say scientists - BBC News
Love this. I am younger than I look? [biggrin] No hair on my head either way now[bigrolf]

