The article presents the development and validation of the 7-point Clinical Frailty Scale (CFS) for assessing frailty in elderly patients. The CFS was designed to be both predictive and easy to use, addressing the lack of a widely accepted clinical definition of frailty. The scale was applied to 2305 participants from the Canadian Study of Health and Aging (CSHA), and its predictive validity was assessed by comparing it with other established tools. The CFS showed high correlation (r = 0.80) with the Frailty Index and significantly increased the risk of death and institutional care over a medium term. Receiver operating characteristic curve analyses indicated that the CFS performed better than measures of cognition, function, or comorbidity in predicting mortality. The study concludes that the CFS is a valid and clinically useful tool for assessing frailty, providing valuable predictive information for healthcare planning and patient care.The article presents the development and validation of the 7-point Clinical Frailty Scale (CFS) for assessing frailty in elderly patients. The CFS was designed to be both predictive and easy to use, addressing the lack of a widely accepted clinical definition of frailty. The scale was applied to 2305 participants from the Canadian Study of Health and Aging (CSHA), and its predictive validity was assessed by comparing it with other established tools. The CFS showed high correlation (r = 0.80) with the Frailty Index and significantly increased the risk of death and institutional care over a medium term. Receiver operating characteristic curve analyses indicated that the CFS performed better than measures of cognition, function, or comorbidity in predicting mortality. The study concludes that the CFS is a valid and clinically useful tool for assessing frailty, providing valuable predictive information for healthcare planning and patient care.