The goal of this observational study is to establish the prospective cohort of the Beijing Longitudinal Disability Survey in Community Elderly (BLINDSCE) to explore the high-risk factors and preventive interventions for disability and cognitive impairment among community-dwelling adults aged 65 years and over. The main question it aims to answer is: - What are the high-risk factors able to predict the incidence and advance of disability and cognitive impairment in community-dwelling adults aged 65 years and over? - What are the categories of function and cognitive performance trajectory in community-dwelling adults aged 65 years and over?