Book: What is dementia?

There is a wider range of diseases that cause early-onset dementia and a younger person is much more likely to have a rarer form of dementia. Alzheimer’s disease is the most common form of early onset dementia. Other forms are vascular dementia, frontal-temporal dementia, Lewy bodies dementia and Korsakoff’s syndrome, which is alcohol related dementia.

People with other conditions, such as Parkinson’s disease, multiple sclerosis, Huntington’s disease or HIV and AIDS, may also develop early onset dementia as part of their illness. Also, people with Down’s syndrome and other learning disabilities can develop dementia at an early age.