Comment by xiphias2

> More seriously, you can in sequence replace all parts of a car and it still functions as the original one (https://en.wikipedia.org/wiki/Ship_of_Theseus), but you can't do that with a human

Actually there’s enough evidence at this point that you can, you just have to do it on the cellular level, not tissue level, and the hardest problem for therapies in living humans is not creating cancer at the same time.

Partial reprogramming (resetting methylation status on the DNA) looks like the most important maintenance to do inside the human cells, but there are other known problems with partly known solutions.