As improvements in medical science and living standards ensure that most of us now live to be old. How do we make sure that we age well-that we are 'evergreen'? That is the question at the heart of Andrew Scott's striking new book, which argues persuasively that aging is as big a challenge for humanity as climate change or artificial intelligence. Scott has some wise suggestions as to how exactly we can do it Niall Ferguson, author of THE ASCENT OF MONEY