10/66 Dementia Research Group Alzheimer's Disease International

Global Burden of Dementia

The work of the 10/66 Dementia Research Group has substantially updated our understanding of the global prevalence and impact of dementia. The information from prevalence and incidence studies in Latin America, India, and China has been synthesised with new data from other research studies, and used to generate new estimates of numbers affected worldwide, published in ADIs 2009 World Alzheimer Report and the World Health Organizations 2012 report: Dementia: a Public Health Priority 2012. Since 2009, the global evidence base has expended, most particularly with new studies from China and sub-Saharan Africa. The previous numbers have been updated using the new evidence emerging from those 2 regions and were presented in a Policy Brief published before the G8 Dementia Summit held on 11 December 2013.

It is now estimated that in 2013 44.3 million people worldwide were living with dementia, this figure nearly doubling every twenty years to reach 135.5 million by the year 2050. The updated estimates are higher than the original estimates reported in the 2009 World Alzheimer Report, by 15% in 2030 and by 17% in 2050.

  • Most people with dementia live in LMIC- 62% in 2013, rising to 66% in 2030 and 71% in 2050.
  • By 2050, increases will be much sharper in low and middle income countries (246%), than in high income countries (131%).
  • The largest increases in projected numbers of people with dementia are those for the Asia East and sub-Saharan African regions, accounted for by the higher age-specific prevalence of dementia estimated in our new reviews of survey from thse regions.
Well designed epidemiological research can generate awareness, inform policy, and encourage service development. However, such evidence is lacking in many world regions, and patchy in others, with few studies and widely varying estimates.

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Latest 10/66 News

  • The Independent Dementia Supplement (May 2014) on pages 6 and 7 used data from the Alzheimer's Disease International. Policy brief for heads of government: The global impact of dementia 2013-2050.

  • Professor Martin Prince's service to the field of psychogeriatrics has been recognised by the International Psychogeriatric Association IPA in its 2011 round of Distinguished Service Awards. Prof Prince’s work was recognised during the IPA 2011 International Congress at The Hague on 6th -9th September. Link

  • Incidence data – now available for open access! The 10/66 incidence studies have now been completed in Cuba, DR, Mexico, Peru, Venezuela, China, including mortality data for India. It followed 11,718 older people free of dementia at baseline with 34,718 person years of follow-up. This is a unique data and one of the largest studies of the incidence of dementia yet conducted. To apply to use this data click here...

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