Oct 25, - In most people, the answer is no. Eye color fully matures in infancy and remains the same for life. But in a small percentage of adults, eye color can naturally become either noticeably darker or lighter with age. What determines eye color is the pigment melanin. Aug 20, - Eye color also can change with age. However, some hazel eyes actually get darker with age. Note that if your adult eye color changes pretty dramatically, or if one eye changes from brown to green or blue to brown (called heterochromia), it's important to see your eye doctor.Brown Eyes · Human Eye Color Chart · Heterochromia · Blue Eyes.