Dementia diagnoses are often delayed for years, new study finds

People with dementia face a long road to diagnosis, according to a comprehensive review published in the International Journal of Geriatric Psychiatry. The analysis found that, on average, individuals wait 3.5 years from the time symptoms first appear until they receive a formal diagnosis. For those with early-onset dementia, the delay is even longer—averaging 4.1 years. These findings highlight ongoing gaps in timely access to care and the need for improved diagnostic strategies, particularly for younger individuals and those with less common forms of dementia.

Dementia is a progressive condition that affects memory, thinking, and behavior. It is not a single disease, but a group of related conditions that include Alzheimer’s disease, frontotemporal dementia, vascular dementia, and others. Symptoms usually worsen over time, eventually interfering with daily life and independence. While dementia primarily affects older adults, younger people can develop early-onset forms, often leading to misdiagnoses or delays in care.

A timely diagnosis is essential for planning treatment, managing symptoms, and helping families prepare for what lies ahead. It also allows individuals to access support services and medications earlier in the course of the disease. National and international health organizations have emphasized the importance of early recognition and response. Yet the actual time it takes to reach a diagnosis remains poorly understood.

To address this gap, a team of researchers at University College London and the University of Jaén conducted the first systematic review and meta-analysis of global evidence on time to diagnosis in dementia.

The researchers searched major medical databases for studies published through December 2024, identifying 13 eligible studies that together included over 30,000 people with dementia. Most of these studies recruited participants from memory clinics, hospitals, or neurology departments, and focused on individuals who had already received a formal diagnosis. The authors defined “time to diagnosis” as the interval between when symptoms first appeared—based on interviews with patients or caregivers—and the moment a diagnosis was made.

Using a meta-analytic approach, the team calculated that across all dementia types, the average time to diagnosis was 3.5 years. For Alzheimer’s disease specifically, the average delay was slightly longer at 3.6 years. People with frontotemporal dementia faced the longest wait, averaging 4.2 years, and those with early-onset forms of the disease had to wait even longer—around 4.1 years. In contrast, people with late-onset dementia were diagnosed more quickly, typically within 2.9 years.

While the overall numbers point to significant delays, the reasons behind them were complex and varied. In general, younger individuals faced longer diagnostic intervals, possibly because healthcare providers are less likely to suspect dementia in younger patients. The type of dementia also made a difference. Frontotemporal dementia, which often affects behavior and language more than memory, proved harder to identify than more typical forms like Alzheimer’s disease.

Some studies suggested that people with lower cognitive test scores or who had difficulty with daily activities were diagnosed more quickly, possibly because their symptoms were more severe or obvious. Other factors that appeared to delay diagnosis included having multiple consultations with different providers, receiving an initial diagnosis of mild cognitive impairment, or undergoing more complex diagnostic procedures like brain scans.

Socioeconomic and racial disparities also played a role. In one U.S.-based study, Black participants and those with less education waited longer to receive a diagnosis, suggesting barriers related to access, healthcare literacy, or provider bias.

The review also found that access to specialist services could make a difference. In Australia, people with early-onset dementia who were seen at a dedicated diagnostic clinic received their diagnosis faster than those who were not. This points to the potential benefits of specialized centers that focus on diagnosing and managing dementia in younger adults.

Despite these insights, the researchers noted that data on the causes of delayed diagnosis were limited and often inconsistent across studies. Many of the factors associated with longer or shorter diagnostic intervals were identified in only a single study, making it hard to draw firm conclusions. The studies also used different methods to define and measure the time to diagnosis, which could have affected the results.

The authors emphasized the need for more research to understand how diagnostic delays affect patients and families, and what can be done to improve the process. They called for the development of standard definitions and criteria for measuring time to diagnosis, as well as better tracking of the steps patients go through from first symptoms to final diagnosis.

While delays in dementia diagnosis are partly due to the gradual onset and vague nature of early symptoms, the findings suggest that the healthcare system itself plays a major role. Long referral pathways, limited access to specialists, and inadequate training for general practitioners may all contribute to the problem.

The authors concluded that improving the timeliness of dementia diagnosis should be a public health priority. This is particularly true for younger patients and those with frontotemporal dementia, who currently face the longest delays. Establishing specialist diagnostic centers, standardizing care pathways, and training healthcare professionals to recognize the wide range of dementia symptoms could help close the gap.

The study, “Time to Diagnosis in Dementia: A Systematic Review With Meta-Analysis,” was published July 27, 2025 and authored by Olubunmi Kusoro, Moïse Roche, Rafael Del-Pino-Casado, Phuong Leung, and Vasiliki Orgeta.