A major European study tracking more than 10,000 older adults over seven years has found that loneliness is linked to worse memory performance, but does not accelerate the rate of memory decline over time. The findings, published in the peer-reviewed journal Aging and Mental Health in April 2026, challenge a widely held assumption that loneliness directly speeds up cognitive deterioration in older age.
The study analyzed data from the Survey of Health, Ageing and Retirement in Europe, known as SHARE, covering the period from 2012 to 2019. The final sample consisted of 10,217 participants aged 65 to 94, drawn from 12 European countries including Germany, Spain, Sweden, and Slovenia. The research was conducted by scientists from the Universidad del Rosario in Colombia, the Clinica Universitaria de Navarra and Universitat de Valencia in Spain, and the Karolinska Institute in Sweden.
How the Loneliness and Memory Study Measured Cognitive Decline
Loneliness was defined as feeling alone and measured using three questions: how much of the time participants felt they lacked companionship, how much of the time they felt left out, and how much of the time they felt isolated from others. Responses were used to categorize participants into low, average, or high loneliness groups. At the start of the study, 7.7 percent of participants reported high loneliness, 26.8 percent reported average loneliness, and 65.5 percent reported low loneliness.
Memory was assessed through immediate and delayed word recall tests. Participants were read a list of 10 words aloud and asked to recall as many as possible within one minute, both immediately and after a delay. Researchers controlled for factors including physical activity, social engagement, depression scores, high blood pressure, and diabetes. Anyone with a prior diagnosis of dementia, including Alzheimer’s disease, was excluded from the study, as were participants with physical impairments affecting daily living activities.
Lonely Older Adults Start With Worse Memory but Decline at the Same Rate
Participants who reported high loneliness at the start of the study scored significantly lower on both immediate and delayed recall tests compared to those with low or average loneliness. When researchers tracked how memory changed across the seven-year follow-up period, however, all three groups experienced memory decline at a similar rate.
Lead author Dr Luis Carlos Venegas-Sanabria, from the School of Medicine and Health Sciences at the Universidad del Rosario, described the finding as a surprising outcome. He said the results suggest loneliness may play a more prominent role in the initial state of memory than in its progressive decline, and that the study underscores the importance of addressing loneliness as a significant factor in cognitive performance in older adults.
The researchers note that loneliness was treated as a fixed characteristic in this study. In reality, feelings of loneliness can shift over time in response to changes in personal circumstances or environment across a person’s lifespan.
The study found geographic variation in loneliness prevalence across Europe. Southern European countries reported the highest levels of high loneliness at 12 percent, followed by Eastern and Northern regions at 9 percent each, and Central Europe at 6 percent. Participants who reported high loneliness were more likely to be older, female, and to report worse self-rated health. They also had higher rates of depression, high blood pressure, and diabetes.
Why Doctors Should Screen Older Patients for Loneliness
The study authors recommend that routine loneliness screening be incorporated into cognitive health assessments for older adults. They describe this as one of several strategies health professionals could develop to support healthier aging. The findings reinforce existing evidence linking loneliness to brain function in older people while also suggesting that isolation may not directly increase the risk of dementia progression.
Jordan Weiss, a professor at NYU Grossman School of Medicine and aging expert, noted that the finding that lonely older adults start with worse memory but do not decline faster is the most significant part of the paper, and cautioned that it is easy to misread. Experts warn the results should not be interpreted to mean loneliness is harmless to brain health overall.
Loneliness is recognized as a significant public health issue because of its documented impact on longevity, mental health, physical health, and overall wellbeing.
