In theory, yes. But that depends on how many healthy cells or stem cells that change to replace them there are. It's a big complex problem really that I think people understate. It's part of why we heal so well up to a certain point in our lives (the ability to remove and kill off faulty or old cells). This wouldn't be a fountain of youth but more like a fountain of "not needing a nurse to wipe your ass when you're 95."