“Not so fast. It turns out humanity’s understanding of its aging process (and how to stop it) is advancing more rapidly than anyone expected. So rapidly, in fact, that some of the planet’s top biologists believe we can hold back the tide of aging, starting now, with today’s drugs and supplements and diets and exercises, just as soon as the medical establishment starts to see aging as a treatable disease. And that means it’s distinctly possible that one of the people I’m writing to in the dawn of the 22nd century is ... myself.”