Blonde hair has less melanin, particularly eumelanin, compared to brown or black hair. As individuals age, their predetermined genetic programming can “order” an increase in melanin production which gradually darkens hair color. Age: With aging, the activity of melanocytes, the cells that produce melanin, changes.

Would you believe that only 2% of the world's population is naturally blonde? Crikey!

Nearly 70% of Icelanders have blond hair and an estimated 90% have blue eyes. Not only is the usually rare combination of blond hair and blue eyes by far the most common combination in Iceland, the even more rare pairing of red hair and green eyes is also atypically frequent.

Blonde hair typically gets darker or turns brown as you age. Hair color is determined by the amount of melanin you have, with very little melanin resulting in blonde hair. Many blondes start producing more melanin as they age, so their hair starts to darken.