I'm actually curious about a certain aspect of Life Return, since we're discussing it. According to one of its canonical users, Kumadori, it's based off of, or otherwise related in some sense to, the concept of the [url=https://en.wikipedia.org/wiki/Sennin]Sennin[/url], which is essentially the Japanese word for immortal in many contexts, e.g. Ikkaku Sennin (一角仙人 "One-horned Immortal"), though the ability itself is more like a highly advanced form of [url=https://en.wikipedia.org/wiki/Biofeedback]biofeedback[/url], as stated in the OP wiki. That being said, is it actually possible for a user of Life Return to becoming completely unaging and thus biologically immortal, say by reversing the telomere shortening of their cells and delaying senescence? The concept's been digging at me since I learned Life Return existed, and it doesn't look like the topic of whether or not users actually age if they don't want to has ever been discussed.