"He tested it on mice that were just old (the equivalent of 90 in mouse years), those genetically programmed to age very rapidly and those aged by chemotherapy.

"He tested it on mice that were just old (the equivalent of 90 in mouse years), those genetically programmed to age very rapidly and those aged by chemotherapy." Great! Too many results have been previously reported just in genetically modified mice that weren't aging normally in the first place.