Throughout the world someone is diagnosed with dementia every 3.2 seconds. Dementia is the name for a group of symptoms caused by diseases that affect memory, thinking, behaviour and emotion. Alzheimer's disease is the most common cause of dementia. Millions of people throughout the world live with dementia. Millions more families and friends live with the daily challenges of dementia. People of all ages, ethnicity and intellectual ability can be affected by dementia and while it is more common in people aged over 65, younger people are also affected. Dementia is distressing and progressive and its effects are far reaching.