Many symptoms of young onset dementia are similar to those of late onset dementia (which affects people over 65). However young onset dementia can also affect people in more unusual ways. This can make it more difficult for people, loved ones, and doctors to recognise and diagnose what is causing the symptoms.

Diseases that cause young onset dementia, like Alzheimer’s, are progressive. This means the symptoms get worse over time and people require more support with their everyday lives. It is difficult to know whether young onset dementia progresses faster. There is some evidence that this is the case but every person’s experience of the disease, including how fast or slow it progresses, is different.

You can use the menu below to find out more about the symptoms of different types of young onset dementia, these lists are just examples and people may experience other symptoms too. If you are concerned about any of these symptoms or your health, either for yourself or someone else, speak to a doctor.

Young onset dementia

This leaflet aims to give an introduction to young onset dementia. It’s for anyone who might be worried about themselves or somebody else.


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This information was updated in March 2022 and is due to be reviewed in March 2024, it was written by Alzheimer’s Research UK’s Information Services team with input from the Young Dementia Network and lay and expert reviewers. Please get in touch if you’d like a version with references or in a different format.

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