Millions of older adults around the world live with hearing loss. Many see it as an annoying part of getting older, something that makes conversations harder or requires turning up the television volume.
However, scientists are increasingly discovering that hearing loss may affect much more than hearing alone. It may also play an important role in how the brain ages.
A major international study led by researchers from the School of Public Health at the LKS Faculty of Medicine of the University of Hong Kong has found that hearing aids may be linked to a lower risk of developing dementia.
The findings suggest that helping older adults hear better could be an important step toward protecting memory and thinking abilities later in life.
Dementia is one of the biggest health challenges facing the world today. It affects memory, thinking, communication, and the ability to carry out everyday tasks. As populations age, the number of people living with dementia is expected to grow rapidly.
Experts estimate that around 150 million people worldwide could be living with dementia by 2050. This growth is expected to place enormous pressure on families, health care systems, and social services.
Scientists have spent years searching for ways to reduce dementia risk. While age remains the strongest risk factor, researchers have identified several factors that may be modified or managed. One of the most important is hearing loss.
Hearing loss becomes increasingly common with age. About 30 percent of people over 65 experience hearing difficulties, and the number rises dramatically among people over 85.
In recent years, studies have suggested that hearing loss may contribute to social isolation, depression, reduced mental stimulation, and changes in brain activity, all of which may increase dementia risk.
To better understand the relationship between hearing aids and dementia, researchers analyzed data from 61,089 adults aged 55 and older who had hearing impairment.
The participants came from seven major aging studies conducted across 33 countries, including China, South Korea, the United Kingdom, Ireland, several European countries, the United States, and Mexico.
The participants were followed for an average of 6.5 years. During that time, 8,911 people developed probable dementia.
The researchers found that people who used hearing aids had a lower risk of developing dementia than those who did not use them. Overall, hearing aid users experienced a 9 percent lower risk.
The most important finding was that the quality of hearing improvement mattered. People who reported that their hearing aids significantly improved their hearing had a 14 percent lower risk of developing dementia. In contrast, people who used hearing aids but felt they did not help much experienced no meaningful reduction in risk.
This suggests that simply wearing a hearing aid may not be enough. The device must actually improve hearing in everyday situations for people to receive the greatest benefit.
The study also revealed important differences between countries. In middle-income countries, hearing aid use was much less common.
Only 2.6 percent of hearing-impaired participants used hearing aids, compared with 20 percent in higher-income countries. Because so few people had access to hearing care, the potential benefits appeared even larger in these regions.
Researchers also found that some groups appeared to benefit more from hearing rehabilitation. The association between hearing aid use and lower dementia risk was stronger among women, unmarried individuals, and people with lower levels of education.
These groups may face a greater risk of social isolation or fewer opportunities to access health resources, making hearing support especially important.
The researchers emphasize that this study cannot prove that hearing aids directly prevent dementia. Because it was an observational study, other factors could also influence the results. Nevertheless, the large size of the study, the long follow-up period, and the involvement of participants from many countries make the findings particularly valuable.
The study was published in Cell Reports Medicine. It provides some of the strongest evidence to date that effective hearing rehabilitation may support healthier brain aging.
The findings suggest that hearing care should not be viewed simply as a way to improve communication. Instead, it may become an important part of dementia prevention and healthy aging programs around the world.
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Source: University of Hong Kong.
