Not very long ago at all, slowing aging was considered a fool's errand. In fact, by many people, it still is. Sure, online ads may show you Photoshopped, or at the very least Photoshopped-looking, pictures of men with wrinkled faces on top of impossibly muscular bodies. But in real life, aging was thought to be inevitable – too complex, and too random, to be significantly stalled by anything as simple as a pill.