Every cell in your entire body (on average) gets replaced over a 7 year span. If you figure that you stopped growing around 18, and your body has been slowly r

Every cell in your entire body (on average) gets replaced over a 7 year span. If you figure that you stopped growing around 18, and your body has been slowly replicating itself since then, it completed the first full replication at 25, the second at 32, the third at 39, the fourth at 46, etc. Each time you accumulate some chaos. As the chaos grows, the cell groups decline in performance. The decline in performance makes it more likely that the next replication will be even worse. While that makes it really unlikely that aging can be reversed, it certainly isn’t logically impossible. All you need to do is expell the chaos, and get one good quality regeneration (possibly taking about 7 years) and then you’d be right back to 18 years old again. That might make it worthwhile enough to be willing to have your body burned by a billion laser shots and float in a vat of liquid for 7 years. We might get to find out in our lifetimes? who knows.