Yes, it does. The hypothesis is that "clock molecules" in the bloodstream provide a global age-clock for about five other tissue-specific age-clocks in the bod

Yes, it does. The hypothesis is that "clock molecules" in the bloodstream provide a global age-clock for about five other tissue-specific age-clocks in the body. Spoofing the global clock signal for a long enough period tricks the subsystem clocks into thinking they are younger than they really are, including the native global age-clock mechanism. Completely replacing your own blood with a young person's blood, repeating if necessary, would also accomplish the same trick, more expensively. The real question is whether old tissues can function like young tissues when tricked into trying.