Hi, there are conditions other than age to which premature graying of the hair has been linked. These include:
Certain medical conditions like multiple sclerosis and thyroid disease
Graying of hair may also occur prematurely because of certain viruses
Vitamin deficiencies may also be responsible for graying of the hair
Mineral deficiencies were thought to be a possible concern as some studies indicated a link between premature graying
Environmental toxins are also thought to be possible causes of premature graying.
Kindly consult Dermatologist...