It means when the hair starts to turn gray before the 20s. The genes are considered a cause of early graying. Also, some reversible causes, such as vitamin B12 deficiency and a thyroid condition, can cause premature graying of hair. Eating more antioxidant-rich foods like olive oil and green tea and correcting disorders can help treat them.
Premature Graying of Hair: Causes, Prevention and Treatment
Due to stress and pollution, many young adults suffer from premature graying of hair. Read this article to find out ways to prevent and treat this condition.

Coping with Leucoderma (Vitiligo): the White Spot Disease
Leucoderma is a common skin condition, and it has a considerable social stigma. It is better to be informed about it and to learn how to support others.

Gray Hair in Children - Causes and Considerations
Gray hair in children can be due to vitamin deficiency, genetics, or underlying disorders. Continue reading for more details.