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Mustaches usually are darker than your own hair.

The little boy down the street from me was born with gray bangs, as he got older to his teens, they became the rest of the color on his hair. I thought his mom was dyeing his hair, but they weren't. Their child's health was otherwise good, and there wasn't any more graying next several years or decades to come. If a child suddenly starts graying like about 4, pediatrician can advise the parents whether blood tests or an evaluation by a dermatologist or other specialist might be helpful to determine a potential cause for the child's gray hair.

Initially, hair is white. The cells in our hair follicles called “Melanocytes” generate pigments the main one being Melanin. This gives our hair its “Color”.

In general, the more melanin present, the darker the hair color; the less melanin, the lighter the hair color.

When these Melanocytes stop producing the pigment the result is a transparent hair. The transparent hair against your healthier darker hair gives the appearance of Gray hair. In reality the hair is not Gray but transparent.

Harvard scientists propose that a failure of melanocyte stem cells (MSC) to maintain the production of melanocytes could cause the graying of hair.

You're 13, you must have a primary doctor since you were little that you go to once in a while? Ask him and see what his ANSWER is.