There are other organisms that do this, so there is no physical limit in this. It's just an engineering problem. For example, telomere shortening is already be

There are other organisms that do this, so there is no physical limit in this. It's just an engineering problem. For example, telomere shortening is already being worked on. Look up Bioviva science, they have made first human experiments and results look very promising. I think people just got used to being fatalist in this regard, because it is psychologically easier than to tackle this problem.