NEFL and dementia: To assess the association between plasma amyloid β (Aβ) 42/40, phosphorylated tau (p‐τ)181, glial fibrillary acidic protein (GFAP), or neurofilament light chain (NfL) and the risk of dementia and to determine whether these plasma biomarkers could improve the ability to predict incident dementia in a general older population.