Doctors will know more by the time you forget

There's plenty not to love about being middle-aged. But by the time today's 40- and 50-somethings reach the age at which they might develop Alzheimer's or dementia, it's likely doctors will know more about their early signs and have drugs to treat them before symptoms show. This week scientists at Harvard University, in the US, published research on a group of retired people they call "super agers'' who have brains that resemble those of people a third of their age, which could provide clues on...