Aged 1 Aging 1 Alzheimer Disease Alzheimer disease 1 Article 1 Australia 1 Cognitive function 1 Dementia 1 Female 1 Humans 1 Language 1 Male 1 Neurodegenerative Diseases 1 Propositional idea density 1 adult 1 aged 1 aging 1 autoanalysis 1 cognition 1 cohort analysis 1 comorbidity 1 controlled study 1 cross-sectional study 1 degenerative disease 1 dementia educational status 1 family history 1 female 1 hearing impairment 1 heart disease 1