What is rarest hair color?

The rarest hair color is red, making up only 1-2% of the world's population. This is because the gene for red hair is recessive and requires both parents to carry it for a child to have red hair. Blond hair is also considered rare, making up only 2% of the world's population. Dark brown and black hair are the most common hair colors, with around 90% of the world's population having one of these shades. Silver or gray hair, associated with aging, is also relatively rare in younger people, making up less than 1% of the population before the age of 30.