Writer and activist Ashton Applewhite talks with Recode's Kara Swisher about her new book, "This Chair Rocks: A Manifesto Against Ageism." In this episode: What society gets wrong about aging; a realistic picture of mental and physical decline; why Applewhite wrote her "manifesto"; why we need to start with ourselves to fight ageism; how Silicon Valley fetishizes youth; How do you change attitudes in tech?; tech’s investments in delaying aging and extending healthspan; and the medical benefits of having a realistic attitude towards aging.