Dementia can affect anyone of any age; however, it is most common among people aged 65 years and older. While ageing increases your risk of dementia, it is not a normal part of ageing. Younger onset dementia describes any form of dementia affecting a person under the age of 65.
The biggest risk factor for dementia is ageing. This means as a person gets older, their risk of developing dementia increases a lot. For people aged between 65 and 69, around 2 in every 100 people have dementia. A person's risk then increases as they age, roughly doubling every five years.
Early-onset Alzheimer's typically appears in the 40s, 50s and early 60s. However, it is not unheard of for an individual to be diagnosed in their 20s or 30s, especially in families who carry one of the three genetic mutations predicting early-onset Alzheimer's disease.
Many people affected by dementia are concerned that they may inherit or pass on dementia. The majority of dementia is not inherited by children and grandchildren. In rarer types of dementia there may be a strong genetic link, but these are only a tiny proportion of overall cases of dementia.
Age. Age is the biggest risk factor for Alzheimer's, as it is for most types of dementia. This means that a person is more likely to get Alzheimer's as they get older. Above the age of 65, a person's risk of developing Alzheimer's doubles about every five years.
The five-minute cognitive test (FCT) was designed to capture deficits in five domains of cognitive abilities, including episodic memory, language fluency, time orientation, visuospatial function, and executive function.
Administration: The examiner reads a list of 5 words at a rate of one per second, giving the following instructions: “This is a memory test. I am going to read a list of words that you will have to remember now and later on. Listen carefully. When I am through, tell me as many words as you can remember.
The Mini-Cog test.
A third test, known as the Mini-Cog, takes 2 to 4 minutes to administer and involves asking patients to recall three words after drawing a picture of a clock. If a patient shows no difficulties recalling the words, it is inferred that he or she does not have dementia.
The Mini-Cog© is a fast and simple screening test to help detect dementia in its early stages. In just 3 minutes, Mini-Cog© can help doctors and other professional care providers identify possible cognitive impairment in older patients.
The Self-Administered Gerocognitive Exam, known as SAGE, is a brief, pen-and-paper cognitive assessment tool designed to detect the early signs of cognitive, memory, or thinking impairments. The test evaluates your thinking abilities. This can help your doctors understand how well your brain is functioning.
The main sign of mild cognitive impairment is a slight decline in mental abilities. Examples include: Memory loss: You may forget recent events or repeat the same questions and stories. You may occasionally forget the names of friends and family members or forget appointments or planned events.
Women have a greater risk of developing dementia during their lifetime. In fact, around twice as many women have Alzheimer's disease – the most common type of dementia – compared to men. The main reason for this greater risk is because women live longer than men and old age is the biggest risk factor for this disease.
Mini-Mental State Examination (MMSE)
This test is currently the most widely used cognitive assessment tool. It takes 10-15 minutes to administer. It is scored out of 30, with a score below 24 suggesting dementia. It is used to assess global cognitive status.
Dementia vs. Alzheimer's Disease: What is the Difference? Dementia is a general term for a decline in mental ability severe enough to interfere with daily life, while Alzheimer's is a specific disease. Alzheimer's is the most common cause of dementia.
There is no one test to determine if someone has dementia. Doctors diagnose Alzheimer's and other types of dementia based on a careful medical history, a physical examination, laboratory tests, and the characteristic changes in thinking, day-to-day function and behavior associated with each type.
Common forms of dementia
Dementia is caused by many different diseases or injuries that directly and indirectly damage the brain. Alzheimer disease is the most common form and may contribute to 60–70% of cases.
The greatest known risk factor for Alzheimer's and other dementias is increasing age, but these disorders are not a normal part of aging. While age increases risk, it is not a direct cause of Alzheimer's. Most individuals with the disease are 65 and older.
We all inherit a copy of some form of APOE from each parent. Those who inherit one copy of APOE-e4 from their mother or father have an increased risk of developing Alzheimer's. Those who inherit two copies from their mother and father have an even higher risk, but not a certainty.
“Dementia is irreversible when caused by degenerative disease or trauma, but might be reversible in some cases when caused by drugs, alcohol, hormone or vitamin imbalances, or depression,” explains The Cleveland Clinic. “The frequency of 'treatable' causes of dementia is believed to be about 20 percent.”
Can single-gene dementias be inherited directly? Yes. If a single-gene dementia is present in a family, it is quite likely that a person from that family will develop dementia: If one of the parents carries the changed gene, each child has a 1 in 2 chance of inheriting it.