I rarely see men in their early/mid 20s with dark arm hair, yet men in their 40s tend to have darker hair.
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This question just made me think of something; when I was ten or so years old, I had a friend who was the same age, and he had really hairy arms. I'm sure it was his nationality, he was middle eastern. Just thought I'd share. And I think this phenomenon is quite common, though change in color and intensity of change will vary from person to person.0