system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why does the hair on our head keep growing, while eyelashes and eyebrows, etc, stop?
gpt
This has been asked a lot so try searching for more explanations.

The short answer is all hair follows the same cycle. It grows to a certain length, then falls out as a new hair starts growing. The length it grows to depends on what type of hair (head hair tends to grow longest) and genetics. So yes, your hair would reach a maximum length if you stopped cutting it; it wouldn't go on forever. The reason you don't notice hair missing when long hairs fall out is that they all fall out at different times so you don't really notice/miss the ones that have fallen out.