[RobotToaster]

In roughly 15 years every cell in your body is replaced, by your logic there's no reason to live past 15, since you're no longer the same person.

[dualogy]

I heard that it varies by cell type from at most 7 years, down to under-24-hours for a few types. But.. that's just my memory from some read many years ago. Curious what the latest official number is.