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.

Genetics and early onset dementia:

Families affected by younger onset dementia may worry that it can be inherited . It is important to point out that not all cases of early onset dementia are thought to be inherited.

One rare form of dementia that can be passed from generation to generation is called Familial Alzheimer’s. This form of dementia can affect people in their 30's and 40's . Where Familial Alzheimer's is present, there is a 50% possibility of passing on the gene to the next generation who would then eventually develop the condition. Some forms of frontal-temporal dementia or Picks condition have a strong family history and in some cases a genetic link has been found. Again, these inherited types of dementia are rare.  

Genetic counselling

If you have a family history of these rare types of dementia you can talk to your doctor about genetic counselling and if it is appropriate for your family. Genetic counselling is a process which will help to determine if your family history suggests genetic testing is an option to be considered.

Resources for You:

Young Dementia UK works to support people under 65 who have been diagnosed with dementia.

Alzheimer Australia have developed a range of ‘Tip Sheets’ for people with younger onset dementia.

More information

About Alzheimer Ireland

The Society was founded in 1982 by a small group of people who were caring for a family member with Alzheimer's Disease or a related dementia. Find out what we docontact us and more

About our services

We offer a range of services for people with Alzheimer's disease and other forms of dementia, their families and carers. All our services operate using the philosophy of person centred care.

Featured Events

Fundraising is an extremely important source of revenue for our services and takes place locally across Ireland as well as through national events and campaigns. We aim is to raise €5 million a year.


The Alzheimer Society of Ireland has, since it was founded, campaigned on behalf of people with dementia and their carers to improve the lives of all those affected by dementia.


We have many items available for sale through our shop. Buy these items will help raise much needed funds for The Society to continue providing vital service all around the country.


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