Loneliness Linked to Poor Memory in Older Adults, But May Not Accelerate Decline

Feeling lonely may impair memory performance in older adults, but it doesn’t appear to speed up cognitive decline over time, according to a new international study published this month in the journal Aging & Mental Health.

Researchers from Colombia, Spain and Sweden analyzed data from more than 10,000 adults aged 65 to 94 across 12 European countries. They discovered that individuals reporting higher levels of loneliness performed worse on memory tests at the beginning of the study. However, over a seven-year follow-up period, memory declined at similar rates regardless of participants’ reported loneliness.

“The finding that loneliness significantly impacted memory, but not the speed of decline in memory over time was a surprising outcome,” said lead author Dr. Luis Carlos Venegas-Sanabria of the Universidad del Rosario’s School of Medicine and Health Sciences. “It suggests that loneliness may play a more prominent role in the initial state of memory than in its progressive decline.”

The research draws on data from the long-running Survey of Health, Ageing and Retirement in Europe (SHARE), which tracked participants between 2012 and 2019. To measure memory performance, subjects were asked to recall words immediately and after a delay. Loneliness was assessed through questions about how often participants felt isolated, left out, or lacking companionship.

Approximately 8% of participants reported high levels of loneliness at the start of the study. This group tended to be older, more likely to be female, and more frequently experienced conditions like depression, high blood pressure, and diabetes.

The findings contribute to an ongoing debate about whether loneliness contributes to dementia risk. While social isolation and loneliness are often considered risk factors for cognitive decline, research results have been inconsistent.

Jordan Weiss, PhD, a scientific advisor and aging expert at Assisted Living Magazine and professor at NYU Grossman School of Medicine, cautions against misinterpreting the results. “The finding that lonely older adults start with worse memory but don’t decline faster is actually the most interesting part of the paper,” Weiss said. “It likely means loneliness does its damage earlier in life, well before people show up in a study like this at 65-plus.”

Weiss suggests that by older age, long-term social patterns may already be established, making it difficult to detect when the effects of loneliness first took hold. “By the time you’re measuring someone in their late 60s, decades of social connection patterns are already baked in,” he explained.

The relationship between loneliness and cognitive health appears more complex than a simple cause-and-effect relationship. Amy Morin, a Florida-based psychotherapist and author, noted that loneliness might not be the root problem but rather a symptom of underlying mental or physical health issues.

“The evidence shows there’s a link between loneliness and cognitive decline but there’s no direct evidence of a cause and effect relationship,” Morin said. “So while they can go hand-in-hand, it’s not clear that loneliness contributes to dementia.”

Health experts emphasize the importance of maintaining social connections as people age. Regular engagement in social activities like joining clubs, meeting with friends, or attending community events can provide valuable mental stimulation and emotional support.

The researchers suggest incorporating loneliness screening into routine cognitive assessments as part of comprehensive care for older adults. This approach could help healthcare providers identify individuals who might benefit from interventions to increase social engagement and potentially support cognitive health.

As populations continue to age worldwide, understanding the complex relationship between social factors and cognitive health becomes increasingly important for developing effective strategies to promote healthy aging and maintain quality of life in later years.