* Scalp Hair: The average lifespan of a hair on your scalp is 2-7 years.
* Eyebrows and Eyelashes: These hairs have a much shorter lifespan, lasting only 30-45 days before shedding.
* Body Hair: The lifespan of body hair varies depending on the location, but it's typically 30-45 days.
Factors that can affect hair lifespan:
* Genetics: Some people are genetically predisposed to have longer or shorter hair lifespans.
* Health: Conditions like thyroid disease, nutritional deficiencies, and stress can affect hair growth and lifespan.
* Age: Hair growth and lifespan tend to decrease with age.
* Hormones: Hormones play a role in hair growth, and fluctuations in hormone levels can affect hair lifespan.
* Medications: Some medications can cause hair loss or affect hair growth cycles.
It's important to note that hair growth is a continuous cycle, so even though a single hair may only last a few years, new hairs are constantly growing to replace them. This is why we don't suddenly go bald when our hair falls out.