The first ever G8 summit on dementia is now underway in London.
There are 44 million people around the world living with dementia, and new research suggests the number of sufferers is expected to treble by 2050.
World Health Organisation director general Margaret Chan says the disease is no longer just a problem for a developed nations.
These figures are causing huge problems for dementia treatment in the UK, the host of the conference.
Treatment is being hampered by spending cuts in their national health service.
Al Jazeera's Neave Barker reports from Bradford in the North of England.