https://www.livescience.com/33179-does-human-body-replace-cells-seven-years.html

Note: the cells in the brain don't get replaced when they die.
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Pretty much: The human body is a ship of Theseus in real time. It doesn't replace all at once of course, but at what point does the ship stop being the ship?

* SOT is a thought experiment. In a nutshell you have a ship that fought in a famed battle. So everyone decides to preserve the ship. Over the next couple of hundred years boards are replaced due to wear/rot/whatever. Eventually all boards are replaced. At what point did it cease being the Ship of Theseus?