1. Triple therapy linked to slower cognitive decline in older adults. 2. Study included 4,651 participants with no dementia at baseline. 3. Improvements noted in semantic and working memory. 4. Autopsied participants on triple therapy had reduced Alzheimer pathology. 5. Dual therapy also slowed cognitive decline. 6. Increased risk of brain infarcts with triple therapy observed. 7. Single-class therapy showed some cognitive benefits too.