This book is for active people who appreciate and enjoy mental quickness in themselves and others. It explains new discoveries by neuroscientists on how and why some older people stay mentally sharp. Also, inside are brain tasks developed by neuroscientists to target specific functions such as working memory. Diagrams clarify which parts of the brain control memory, emotions and executive skills. Normal mental slowdown from ageing is different to diseases such as Alzheimer's and this book includes simple tests prepared by the American Medical Association that help doctors to reveal the presence of serious dementia.