Most people with dementia are older, but not all older people get dementia. Although it’s not a normal part of ageing, dementia can happen to anyone.

Source of information: Alzheimer’s Australia

Most people with dementia are older, but not all older people get dementia. It is not a normal part of ageing. Dementia can happen to anybody, but it is more common after the age of 65 years. People in their 40s and 50s can also have dementia (younger onset dementia).

Alzheimer’s Australia has produced a thorough range of Fact Sheets and Help Sheets. You can also find more useful information on the Resources section of their website.

Dementia describes a collection of symptoms that are caused by disorders affecting the brain. It is not one specific disease. Dementia affects thinking, behaviour and the ability to perform everyday tasks. Brain function is affected enough to interfere with the person’s normal social or working life. It can result in changes in personality, and affect a person’s ability to maintain relationships.

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There are many different forms of dementia and each has its own causes. The most common types are; Alzheimer’s disease, vascular dementia, Parkinson’s disease, dementia with Lewy bodies, Fronto Temporal Lobar Degeneration (FTLD), Huntington’s disease, alcohol related dementia (Korsakoff’s syndrome) and Creutzfeldt-Jacob disease. You will find Help sheets on these and other types of Dementia in the ‘About Dementia’ section of the Help Sheets.


This is the most common form and the most widely known. It accounts for between 50%-70% of all cases. It occurs when nerve cells deteriorate in the brain due to a build up of ‘plaques’ and ‘tangles’ and other chemical changes that damage brain cells. More…


This is the second most common form of dementia accounting for 20% of all dementia cases. Vascular Dementia is the broad term for dementia associated with problems arising from a lack of circulation of blood and oxygen to the brain. More…


Parkinson’s is a progressive neurological condition, which is characterised by both motor (movement) and non-motor symptoms. Dementia may, or may not develop with this condition, and there are common cognitive changes which occur with Parkinson’s which are often mistaken for dementia. The Parkinson’s SA website has a detailed series of Information Sheets on Parkinson’s Disease. More…


Lewy body disease is a common neuro-degenerative disease of ageing. This means that the disease causes gradual brain damage. For reasons not fully understood, it occurs when there is an abnormal build up of a protein called alphasynuclein in brain cells. These abnormalities occur in specific areas of the brain, causing changes in movement, thinking and behaviour. More…


Frontotemporal dementia involves progressive damage to the frontal and/or temporal lobes of the brain. Symptoms often begin when people are in their 50s or 60s, sometimes earlier. There are two main presentations of frontotemporal dementia – frontal (involving behavioural symptoms and personality changes) and temporal (involving language impairments). More…


A person who has memory loss/dementia and is under the age of 65 years is said to have younger onset dementia. It is important to get specialist diagnosis to determine the type of dementia involved. Many people developing dementia under the age of 65 years have Frontotemporal dementia. Read the younger onset dementia series of Help Sheets.