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.
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.
Dementia affects millions of people and is more common as people grow older (about one-third of all people age 85 or older may have some form of dementia) but it is not a normal part of aging. Many people live into their 90s and beyond without any signs of dementia.
Age is the biggest risk factor: most people with dementia are older than 65 and the likelihood increases as people get older into their 80's and 90's. This tells us that older people are more likely to develop dementia than younger people.
Older adults with more education are less likely to develop dementia; they spend a larger portion of their lives cognitively healthy and fewer years with dementia.
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.
Researchers found that chronic stress is a significant risk factor for dementia. Because this study looked at several previous studies, its findings are particularly convincing. A study of 1,700 seniors with an average age of 77 found a link between depression—which can both cause and be caused by stress—and dementia.
Introduction: The five-word test (5WT) is a serial verbal memory test with semantic cuing. It is proposed to rapidly evaluate memory of aging people and has previously shown its sensitivity and its specificity in identifying patients with AD.
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.
“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.”
Researchers have suggested that people who have more education or do more mentally stimulating activities throughout life build up a higher cognitive reserve, allowing their brain to resist damage caused by disease like Alzheimer's for longer.
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.
It's been estimated that one in three cases of dementia is preventable. You can't do anything right now to stop or reverse the underlying mechanisms of Alzheimer's disease, but you can do something about hypertension and vascular disease risk factors.
In addition, highly intelligent people have been found, on average, to show clinical signs of Alzheimer's later than the general population. Once they do, they decline much faster. Thought to reflect their greater mental reserves, this different pattern may call for a different approach to diagnosis.
Patient assessment tools:
The GPCOG is a screening tool for cognitive impairment designed for use in primary care and is available in multiple languages. Mini-Cog - The Mini-Cog is a 3-minute test consisting of a recall test for memory and a scored clock-drawing test.
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.
Other foods that may reduce dementia risk
The MIND diet encourages people to eat green leafy vegetables, berries, nuts, whole grains, fish, poultry, beans, unsaturated fats like olive oil, eggs, and low amounts of red meat.