Thirty-five million people around the world suffer from dementia, a progressive, degenerative brain syndrome which affects memory, behaviour and emotion.
The most common cause of dementia is Alzheimer's disease.
As the disease progresses, people with Alzheimer's need more support from those who care for them. Eventually they will need help with all of their daily activities.
The World Today brings together two people who know how difficult it can be caring for someone with dementia: Anne, in South Africa, whose husband of 57 years has Alzheimer's and Mark Fleischman in the UK, whose stepfather has Alzheimer's.
First broadcast 3 February 2010
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