The original post: /r/askscience by /u/puppycows on 2024-10-29 12:48:56.

Why does our hair color darken with age?

So when I was born up until I was 14, my hair was a light brown color with natural blonde parts. Now at 18, my hair is very dark brown, almost black. (My mom has black hair.) I wonder why this happens? I was thinking, wouldn’t it make sense that since hair color is genetic, it would be consistent throughout your entire life.