Multiple choice

What is the lifespan of the average hair?

  1. 1 year

  2. 5 years

  3. 10 years

  4. 20 years

Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The active growth phase (anagen) of a hair follicle typically lasts between 2 to 7 years, making 5 years a representative average lifespan for a single hair. After this phase, the hair enters resting and shedding phases before a new one grows.