protein drug help us live longer

I read study:fountain of youth for your heart? this was about a scientist that helped discover how the ageing of the heart leads to a earlier death and how protein could help is live longer by helping the fat go into the cells of your heart. I have to kind of wonder about this, I know the protein is used in your body for many different things such as other nutrients would be. But could a protein drug really improve your life that much? Did they simply get this idea from people that eat healthy food all the time live longer? And the test (done on a mouse) cant be all that accurate, first off it has different genetics then us and the test subjects used with the protein drug could have been much more active then the ones without it. Even with my speculations on this study I do think it to be rather useful compared to other studies i have heard scientist do like how four scientist took a couple months of a study just to find out a person can solve a rubix cube in ten minutes. To put it generally I think that this is one of the more useful studies for scientist and could be a very good one for mankind, if they can find a way to reverse the ageing of the heart they could also find out how to do it to the mind and the rest of the body which could keep people alive much longer then they currently are, could you imagine a world where you could keep your mind thinking like it does when you are a little kid? We would have a future were the worst IQ would be at the level of Einstein!