system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why do tattoo's stay on your skin for your whole life?
gpt
They are under your skin, below the layers that regenerate. Therefore they are not affected by new skin growth, changes in skin (like spots or a tan) etc, and thats why they can stay for at least a very long time. They dont last indefinately tho, most will at some point lose their color and/or fade.