Dementia is the term used when a person experiences a gradual loss of brain function due to physical changes in the structure of their brain.
Dementia is not a normal part of the ageing process. However, it is more common for people over the age of 65, but can affect people as young as 45.
There are many causes of dementia, but the most common is Alzheimer’s disease. Other causes include vascular dementia, dementia with Lewy bodies and fronto-temporal dementia.
A person can have a combination of different causes of dementia. Each cause tends to affect particular areas of the brain and will cause different changes in a person’s behaviour.