We all become slower and more forgetful as we age, some of us more than others. When this change is accelerated and interferes with a variety of thinking or cognitive abilities and interferes with our day to day functioning, this is diagnosed as dementia, of which the most common type is Alzheimer’s disease. Surveys of the population indicate that dementia in general and Alzheimer’s in particular, along with cancer, are the health problems that we generally fear most. Rightly so! As we are living longer the chances of developing a dementia increase dramatically – at least affecting 5% or some estimates 8% of people over 65 years of age, rising to 30% of people aged over 90 and 50% of those reaching 100. Glass half empty people will be despondent about these figures. Glass half-full people will say, what can I do to be like the 50% of mentally sharp centenarians?