8. Age-Related Causes

Although quite rare, some people’s eye color can also change even after infancy. A study published in “JAMA Ophthalmology” in 1997 stated that “10 to 15-percent of white children experienced subtle changes in eye color after age 6 and into early adulthood.”

But according to the researchers, this is most likely to occur only in people of a certain genetic disposition, so it would have been a trait that was passed down through generations family history. They also say that those with lighter-colored eyes are more likely to notice a change, compared to those with darker-colored irises.