Is it that they don’t know or the “threshold” is so long that we don’t get to see it very often?
In: Biology
Asked and answered in 2015: Actually, all hair stops growing after a certain length! Leg hair, arm hair, eyelashes, eyebrows, head hair, and even the hair on your butt will stop growing after a certain period of time. Exactly how long your hair can grow depends primarily on your genetics, but age, hormones, and general health can all play a part.
Hair growth occurs in three phases. The first phase is called the anagen phase and it is during this time that the hair actually grows. About 85% of the hair on your head is in this phase at any given time. This phase can last between two and six years for head hair and the duration of this phase will determine just how fast and how long your hair can grow.
The second phase is the catagen phase. During this phase, the hair follicle separates from the hair strand itself and does some things to prepare itself for the next phase.
The third phase is called the telogen phase and it’s known as the resting phase. Around 15% of your hairs will be in this phase at any given moment. Once this phase is over, the cycle begins anew with the anagen phase.
[You can read more about Human hair growth at Wikipedia.](http://en.wikipedia.org/wiki/Human_hair_growth) Take a look at the sidebar for information about the different kinds of hair, too!
It has been five years since I’ve had my head hair last cut and it’s stopped growing about mid-way down my back. That’s a pretty typical length for males. Female hair tends to stop somewhere around the buttocks.
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