I had an idea for my Star Wars rpg campaign (set around 5 bby) that my characters would encounter a clone veteran who found a way to reverse his rapid aging via experimental carbon freezing treatments. So, even though he should have the body of an old man, he still appears to be in his prime. His motto of "what's a soldier who can't fight?" led him to pursue a way to reverse his aging so he could continue to fight the empire. Is this theoretically possible, or is it a dumb idea?