Most people associate gray hair with aging, but some start seeing grays as early as their teens.
There are many factors that can cause hair to lose its natural color, including genetics, a vitamin deficiency, thyroid disorders, smoking and vitiligo, a skin condition that causes loss of pigment.
Severe stress also can contribute to graying hair.
To simplify the scientific details of why hair turns gray, certain cells called melanocytes become defective or die off. These are the cells that produce the pigment known as melanin that give your skin and hair its color. Read the entire article HERE.