A new study published in Neurology suggests that the effects of early-onset dementia may begin many years before a doctor makes the diagnosis.
Researchers from the University of Eastern Finland found that many people who later developed early-onset dementia earned less money and appeared to become less productive at work as early as 15 years before they were diagnosed. The findings provide new evidence that the disease may quietly affect everyday life long before memory problems become obvious.
Dementia is not a single disease. It is a group of conditions that slowly damage the brain and affect memory, thinking, language, judgment, and behavior. Most people with dementia are older than 65, but some develop the condition much earlier.
When dementia begins before the age of 65, it is called early-onset dementia. Because these people are usually still working, raising families, and paying mortgages, the disease can have a major financial and emotional impact.
Many people think dementia begins suddenly with obvious memory loss. In reality, brain changes often develop slowly over many years. Small problems with planning, concentration, decision-making, communication, or managing complex tasks may appear first. These early changes can make work more difficult even when the person does not realize anything is wrong.
The Finnish research team studied 793 people diagnosed with early-onset dementia at two hospitals over 12 years. They compared them with 7,926 similar adults who did not have dementia.
Using national health records, education records, and tax records, the researchers estimated work productivity by comparing annual income while also taking education and other health conditions into account.
The results showed a clear pattern. People who later developed early-onset dementia experienced steadily increasing productivity losses for many years before diagnosis. On average, the total loss reached about 74,577 euros, or roughly 86,000 US dollars, per person. Average yearly losses were close to 12,000 euros.
The timing differed depending on the type of dementia. People with Alzheimer’s disease began showing reduced productivity about six years before diagnosis. For frontotemporal dementia, the decline appeared around 11 years earlier.
People with alpha-synuclein disorders, including dementia with Lewy bodies and Parkinson’s disease dementia, showed noticeable losses mainly around diagnosis, while other forms of dementia showed consistently high losses throughout the study period.
Lead author Dr. Eino Solje explained that delayed diagnosis may partly explain these findings. People may struggle with subtle symptoms for years before receiving the correct diagnosis, leaving them without support or treatment during an important stage of the disease.
The researchers stressed that this was an observational study. It does not prove that dementia directly caused lower productivity. Other factors may also contribute. However, the strong association suggests that unexplained changes in work performance deserve attention, particularly when they occur alongside changes in memory, behavior, or thinking.
The findings highlight the importance of earlier recognition, better workplace support, improved access to specialist assessment, and further research. Future studies may follow people over time with detailed thinking tests to identify the earliest changes and develop ways to slow decline before major disability develops.
Overall, this is an important study because it looks beyond memory loss and shows that dementia can quietly affect working life many years before diagnosis. Its strengths include a large national dataset and long follow-up.
However, because it cannot prove cause and effect and was carried out in Finland, the results should be confirmed in other countries. Even so, the research reminds doctors, employers, and families that subtle changes at work may sometimes be an early sign of brain disease rather than poor performance.
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Source: University of Eastern Finland.
