Why did my eyes change color?

I'm 47% Welsh, 44% German, and 9% other mixed European, and my family has been in the US for about 7 generations. For the first ten years of my life my eyes were a deep aqua. When I was eleven though, my eyes turned a dark blue-grey color with an indigo color around the edges of the iris. Why did this color change happen?
Answer:

Eye color is based on the number and color of pigment granules (melanin) in our eyes. Newborns often have non-pigmented (blue) eyes, which will change and darken in the first six years of life. More or darker pigment means darker eyes, fewer or lighter granules result in lighter eyes. Hazel eyes can appear to change color, due to less pigment and more effect of the exterior environment. Eye color can change with puberty, likely due to a genetic component. There may be environmental factors that affect eye color. One study states that 10 — 15% of Caucasian eyes change color as they age. Other races have darker eyes, which do not change significantly with age. As pigment in the iris changes or degrades, the eye color usually lightens. However, hazel or blue eyes can darken.

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Other answers

Eye color is based on the number and color of pigment granules (melanin) in our eyes. Newborns often have non-pigmented (blue) eyes, which will change and darken in the first six years of life. More or darker pigment means darker eyes, fewer or lighter granules result in lighter eyes. Hazel eyes can appear to change color, due to less pigment and more effect of the exterior environment. Eye color can change with puberty, likely due to a genetic component. There may be environmental factors that affect eye color. One study states that 10 — 15% of Caucasian eyes change color as they age. Other races have darker eyes, which do not change significantly with age. As pigment in the iris changes or degrades, the eye color usually lightens. However, hazel or blue eyes can darken.

Winston Chau

It's actually pretty common to have different eyes colours when you get older.

G-Girl95

It's actually pretty common to have different eyes colours when you get older.

G-Girl95

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