Cohort study: no association was found between statin therapy and cognitive decline or incident dementia in older adults.

Effect of Statin Therapy on Cognitive Decline and Incident Dementia in Older Adults – Journal of the American College of Cardiology

Commentaries: Statin Therapy Not Associated With Cognitive Decline, Dementia in Older Adults, Study Says – American College of Cardiology AND Effect of Statins on Cognitive Decline and Dementia in Older Adults – American College of Cardiology