Is this true what my friend said about E?

[Monkey4Sale]

All cells in your body regenerate every 12 years.

Nothing is permanent.

I think you're confused. Been smoking your text book, instead of reading it. You're pretty much loosing cells all the time, some of which never come back. Some cells regenerate, but not all. Also, where did you get 12 years? Some cells regenerate daily, others take a while.