Dementia after age 90: Study clarifies who may be at higher risk

MedicalXpress | 八月 05, 2026

It may seem natural to assume that people experience cognitive decline after age 90, but until recently, researchers had limited evidence about how advanced age affects the brain. This major knowledge gap will need to be addressed as people live longer. By 2100, there could be around 230 million people 90 or older on Earth. As a result, scientists, clinicians and policymakers are seeking more information to help them support this expanding demographic.