It's an observable phenomenon that the gap in life satisfaction between the very young and the very old with those in their 40s is equivalent to that associated with getting a divorce. Kieran Setiya, the MIT philosopher and author of Midlife: A Philosophical Guide, chooses the best books to counsel you through this difficult period.

Old age. We all hope to reach it, but there are big differences between a 'good' old age and one beset by dementia or Alzheimer's. Neuroscientist and science writer, Kathleen Taylor, talks us through the latest science on ageing and the literary works that can give us a clearer picture of what it's all about.

Is old age necessarily degrading? Should we leave home in our final years? Is there ever a good time to go? Novelist, biographer and critic Dame Margaret Drabble, now aged 80, discusses the difficult questions that arise as we age—and recommends five books that examine them in depth.