Fit at 70

In my professional life, I study neurodegenerative disease, the mechanisms of aging, and what the two have in common. I was reading through a textbook on aging a few months ago, and I came across an interesting series of graphs.The first graph showed the average cardiorespiratory endurance of Americans at different ages. It peaks around 30 and goes downhill from there. But the author of this chapter was very intelligent; he knew that averages...