About 3.4 million people, or 13.9 percent of the population age 71 and older, have some form of dementia, the study found. As expected, the prevalence of dementia increased dramatically with age, from five percent of those aged 71 to 79 to 37.4 percent of those age 90 and older.
Dementia 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. There are several different forms of dementia, including Alzheimer’s disease.
The biggest risk factor for dementia is age – the older you are the more likely you are to develop the condition, but it is not an inevitable part of ageing. About two in 100 people aged between 65 to 69 have dementia, and this figure rises to one in five for those aged between 85 to 89.
Age is the greatest of these three risk factors. As noted in the Prevalence section, the percentage of people with Alzheimer’s dementia increases dramatically with age: 3% of people age 65-74, 17% of people age 75-84 and 32% of people age 85 or older have Alzheimer’s dementia.
The total population prevalence of dementia among over 65s is 7.1% (based on 2013 population data). This equals one in every 79 (1.3%) of the entire UK population, and 1 in every 14 of the population aged 65 years and over.
The 10 warning signs of dementia
Dementia is more common in people over the age of 65, but it can also affect younger people. Early onset of the disease can begin when people are in their 30s, 40s, or 50s. With treatment and early diagnosis, you can slow the progression of the disease and maintain mental function.
Dementia mainly affects people over the age of 65 (one in 14 people in this age group have dementia), and the likelihood of developing dementia increases significantly with age. However, dementia can affect younger people too.
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. After age 65, the risk of Alzheimer’s doubles every five years.
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.
According to the National Institute on Aging, “beginning treatment early in the disease process may help preserve daily functioning for some time.” According to the Alzheimer’s Association, on average, a person with Alzheimer’s lives 4 to 8 years after diagnosis. However, some people live with dementia for 20 years.
As we age, our brains change, but Alzheimer’s disease and related dementias are not an inevitable part of aging. In fact, up to 40% of dementia cases may be prevented or delayed. It helps to understand what’s normal and what’s not when it comes to brain health.
Based on findings from the 90+ Study, the incidence of dementia from all causes continues to increase exponentially and is very similar in both men and women, even in those of very advanced age: from 13% per year in the 90 to 94 age group, to 21% per year in the 95 to 99 age group, to 41% per year in centenarians; a
There’s no certain way to prevent all types of dementia, as researchers are still investigating how the condition develops. However, there’s good evidence that a healthy lifestyle can help reduce your risk of developing dementia when you’re older.
Alzheimer’s disease is the most common cause of a progressive dementia in older adults, but there are a number of other causes of dementia. Depending on the cause, some dementia symptoms might be reversible.
Worldwide, women with dementia outnumber men 2 to 1. Brain scans tell us that the rate at which brain cells are dying in the brain is faster in women than in men. Women are more likely to live longer than men. However, although risk increases with age, dementia is caused by diseases of the brain not age alone.