Cognitive Impairment Cohort Study of the Elderly Population in YuGarden

This study is a prospective observational study which involves a large sample cohort of the elderly aged 60 to 85 years in YuGarden community, Shanghai, China, with an 8-year follow-up. Demographic information, peripheral organs evaluation (facial expression, hearing, OCT angiography), cognitive tests (MMSE, ADL), biospecimen (peripheral blood, urine, feces, gingival crevicular fluid), speech information, neuroimaging (MRI, PET) and electroencephalogram (EEG) will be collected and analyzed. Follow-up visits will be conducted twice a year for 4 visits and each visit includes cognitive tests, biospecimen collection, speech test, MRI and EEG. The primary outcome is the incidence of cognitive impairment indicating people who convert to mild cognitive impairment (MCI) or Alzheimer's disease (AD). Furthermore, a predictive model for the progression of cognitive impairment will be constructed.