White hair at an early age can be caused by various factors, including genetics, underlying health conditions, and lifestyle choices. Here are some common causes of premature white hair:

• Genetics: If your parents or grandparents had white hair at an early age, you may be more likely to experience it as well.

• Vitamin deficiencies: A deficiency in vitamin B-12 or other vitamins can cause premature white hair.

• Autoimmune conditions: Alopecia areata, an autoimmune skin condition that causes hair loss, can also result in white hair when the hair grows back.

• Thyroid problems: Hormonal changes caused by an overactive or underactive thyroid gland can cause your body to produce less melanin, resulting in white hair.

• Smoking: Studies have linked smoking to premature graying.

• Stress: While there is conflicting research on the link between stress and premature graying, some studies suggest that real-life stressors can speed up the process.

It is important to note that going gray or white is a natural part of aging, and in most cases, it is not a cause for concern. However, if you are experiencing premature white hair and are concerned about an underlying health condition, it is best to consult with a healthcare professional.