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Why Does Our Hair Grow Darker as We Get Older
°ü¸®ÀÚ 2025-10-01 ¿ÀÈÄ 4:28:33 56

 

Why Does Our Hair Grow Darker as We Get Older?

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Description:

 

If you started out as the blondest kid in your kindergarten class and became a brunette by high school, you¡¯re not the only one. As people get older, their hair often gets darker.

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Transcription:

 

Why does our hair grow darker as we get older?

 

If you started out as the blondest kid in your kindergarten class and became a brunette by high school, you're not the only one.

 

As people get older, their hair often gets darker. According to science, this is due to changes in the production of melanin, the natural pigment responsible for hair, eye, and skin color.

 

Two types of melanin are common. Eumelanin determines how dark your hair is, while pheomelanin controls how warm it is.

 

In other words, black-haired people produce the most eumelanin, and red-haired people produce the most pheomelanin.

 

Melanocytes are the cells located at the bottom of each hair follicle that actually create these pigments, and they take their cues from your genes.

 

But genes don't direct melanocytes to produce melanin with the same consistency for your entire life. Hormones can activate or deactivate certain genes.

 

When you hit puberty, for example, previously latent genes may leap into action and create much more eumelanin than before, darkening your locks.

 

With time, however, cells aren't able to regenerate as quickly as they can when we're young, so melanocytes don't churn out as much color.

 

As melanin decreases, new hair comes in gray or even white. When exactly that happens to you mostly depends again on your genes.

 

If every person in your extended family has dark tresses well into their 60s, your own chances are pretty good.

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Questions:

 

1. What role do hormones play in the production of melanin during puberty?

2. Why do some people's hair turn gray or white as they age?

3. How do genetics influence the timing of hair color changes over a person's lifetime?​


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