Every year, 32,000 new cases of Alzheimer’s disease or another form of dementia are diagnosed in Switzerland. The vast majority of these new patients are over 65 years old. The memory clinics which opened their doors several years ago in hospitals in French-speaking Switzerland – and more broadly in Western countries – have the expertise and technologies necessary to establish the diagnosis and management of these cognitive disorders linked to the deposition of unwanted proteins in the brain. But what regarding the prevention of these dementias?