How does someone's hair changes from blonde to a dark color?

For instance when my older cousin's son was a 1 year-old baby, he had a dirty blonde hair. But as he got older, it turned into a light browish tone.

Similar with actor Miko Hughes.
Picture of him as a child:
How does someone's hair changes from blonde to a dark color?
In the present time:


Updates:
Note: In other shows, as he was getting older... he no longer had that blonde hair such as here:
celebritykids.name/.../8362-813.gif

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What Guys Said 0

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What Girls Said 1

  • My moms was strawberry blonde all the way to her late 20's but now is a dirty blonde. Just like skin color can darken with age so does eye color and hair color.

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