� Dementia risk is elevated in people with intellectual disability, particularly for those with Down syndrome � Differences in lifestyle factors have been cited as factors that exacerbate dementia risk in people with intellectual disability � Lifestyle factors can be targeted to enhance cognitive reserve and reduce dementia risk for people with intellectual disability
| INTRODUCTIONOver the 20th century, and into the 21st, the longevity of people with an intellectual disability has shown a remarkable, although not always sustained, increase from an average of 30 years in the past to over 60 years today. 1,2 Longer life also means vulnerability to some negative health developments and disorders associated with ageing, including dementia; a longitudinal study of people with Down syndrome (the most common genetic cause of intellectual disability) estimated the cumulative risk to be 88% by age 65 3 with mean age of diagnosis of 55 years. 3,4 Onset age for people with intellectual disability without Down syndrome is closer to ages for the general population, but incidence is estimated to be as much as five times higher than the general population. 5 In addition to heightened dependency, people with Down syndrome who develop dementia have also been found to have a higher number of comorbid health conditions 3,6 and increased mortality rates. 7 However, there remains large variation in the clinical presentation and confirmed diagnosis of Alzheimer's disease, with rate of disease progression and related decline often unclear and poorly understood in people with intellectual disability.Dementia is challenging to detect or diagnose in this population, 8 as clinicians cannot simply use the same assessments employed with the general population, which depend on an assumed minimum This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.