Belgium’s Dementia Crisis: 4 Factors for Life Expectancy
The number of Belgians living with dementia is rising at an alarming rate, with projections showing a 65% increase by 2050. According to new data from Het Laatste Nieuws, an estimated 214,736 people in Belgium had dementia in 2025, a figure expected to surge past 353,000 within the next 25 years. For patients and families facing this diagnosis, the most pressing question is: how long can you live after diagnosis, and what determines that timeline?
The Growing Challenge
Dementia is already one of Belgium’s most significant public health challenges, driven primarily by the country’s aging population. In 2025, roughly 135,631 people in Flanders were living with dementia, alongside approximately 15,000 in Brussels and 64,000 in Wallonia and the German-speaking Community. By 2030, that national figure will exceed 236,000, and by 2035, nearly 264,000 Belgians will have the condition — a 23% increase in just a decade.
Flanders faces the steepest rise. Projections from Stop Alzheimer and Expertisecentrum Dementie Vlaanderen, using the updated risk model from Alzheimer Europe, indicate that by 2050, the region will see a 68% increase, with 227,681 people affected. “These figures are no surprise, but they are an alarm signal,” said Peter van Houtven, director of Alzheimer Liga Vlaanderen. “Behind these figures are people, families, and stories. Dementia never affects only the person themselves, but an entire environment.”
Life Expectancy After Diagnosis
A landmark systematic review published in The BMJ, analyzing 261 studies involving more than 5 million people with dementia, found that average survival ranges from 8.9 years at age 60 for women to just 2.2 years at age 85 for men. Overall, dementia reduces life expectancy by about two years for those diagnosed at 85, three to four years at 80, and up to 13 years at 65.
Prof. dr. Rik Vandenberghe of the Memory Clinic at UZ Leuven offers a more optimistic perspective for Belgium. “Some of the analyzed studies date back to 1984. Meanwhile, memory clinics are able to diagnose Alzheimer’s earlier,” he explained. “Therefore the current life expectancy from diagnosis is higher here: five to seven years for a relatively rapid progression, or 13 to 15 years for a slow progression.”
The Four Crucial Factors
According to Prof. Vandenberghe and the latest research, four key factors determine how long a patient can live after a dementia diagnosis:
1. Age at Diagnosis
Age is the single most important factor. “At higher ages, other pathologies contribute to a shorter life expectancy,” Vandenberghe noted. A 60-year-old woman diagnosed with dementia may live nearly nine more years, while an 85-year-old man faces just over two years.
2. Type of Dementia
The specific form of dementia dramatically influences prognosis. Lewy body dementia, the second most common type, often follows a rapid, aggressive course. Frontotemporal dementia varies widely — some forms progress slowly, others rapidly. Alzheimer’s disease generally has a slower progression, with patients living longer on average.
3. Physical Fitness and Lifestyle
While exercise has not been proven to directly slow the disease’s progression, its benefits are real. “Good fitness has a positive effect on day/night rhythm and mood in people who received a dementia diagnosis,” said Vandenberghe. He recommends aerobic exercise five times per week for 30 minutes, keeping the heart rate between 100 and 140 beats per minute.
Notably, brain-training games like Sudoku, specific dietary patterns, and early diagnosis itself have not been shown to alter the course of the disease. “It is not proven that sufficient physical exercise influences the course of dementia,” Vandenberghe clarified, though the quality-of-life benefits remain significant.
4. Living Environment
Dementia tends to progress more slowly at home, but experts caution that this is correlational rather than causal. “You cannot say that someone dies sooner because they live in a care facility,” Vandenberghe explained. “Patients usually move to a residential care center when they are in a more advanced stage of the disease.” The timing of this transition has shifted: most patients now move one to three years before death, compared to earlier in the past.
A Healthcare System Under Pressure
The projected increase represents an unprecedented challenge for Belgium’s healthcare system. Jurn Verschraegen, director of Expertisecentrum Dementie Vlaanderen, warned: “Targeted investments in support, timely detection, and expertise development remain necessary. The capacity of professional and informal care is under pressure today.”
About one-third of dementia patients are admitted to a nursing home within three years of diagnosis, and 57% within five years, according to the BMJ study. With numbers rising sharply, the demand for both professional caregivers and family support networks will intensify.
What’s Next
Belgium faces a demographic reality that cannot be reversed: an aging population means more dementia cases. While prevention efforts — the Lancet Commission has identified 14 modifiable risk factors that could prevent or delay up to 45% of cases — remain crucial, the immediate challenge is preparing the healthcare system for the wave of patients already on the horizon.
For families navigating a dementia diagnosis, Prof. Vandenberghe emphasizes that individual prognosis remains difficult to predict with precision. “To make a reliable statement, we must first closely monitor a patient. Then we see how quickly the disease progresses.” What is clear is that the four factors — age, dementia type, physical fitness, and living environment — provide the best framework for understanding what lies ahead.