Hi Nancy, this seems to be a very popular question!
If you look really closely to where your hair start you can see that the hair is growing from underneath your skin. A hair starts growing just below your skin in something called a follicle (the Dutch word for this is “hairpocket” which I like better!). The hair starts growing from the bottom, underneath your skin, about 6 mm per month pushing it through your skin outside. This means that the end of a hair is much older then the hair just popping out of your skin. If you have long hair, each section of 7.2 cm took 1 year to grow!
A good answer from Cees. I will just add to it that hair is made out of a protein called keratin (very long protein, it is a bit like pieces of wire, which is why the hair is quite strong) which is produced in the follicle. So in order to make your hair grow, the protein keratin must be produced and assembled in the cells inside the hair follicle and then hey presto, what Cees has explained will happen.
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