The European Working Group on Sarcopenia in Older People (EWGSOP) has developed a practical clinical definition and consensus diagnostic criteria for age-related sarcopenia, endorsed by several European medical societies. Sarcopenia is defined as a syndrome characterized by progressive and generalized loss of skeletal muscle mass and strength, leading to adverse outcomes such as physical disability, poor quality of life, and increased risk of death. The group recommends using both low muscle mass and low muscle function (strength or performance) for diagnosis. They propose conceptual stages of 'presarcopenia', 'sarcopenia', and 'severe sarcopenia' to guide clinical management. Various measurement techniques for muscle mass, strength, and physical performance are reviewed, with recommendations for their use in research and clinical practice. Cut-off points for diagnosis are based on normative populations, and an algorithm for case finding in older individuals is suggested. The ultimate goal is to identify dietary strategies, lifestyle changes, and treatments to prevent or delay the onset of sarcopenia.The European Working Group on Sarcopenia in Older People (EWGSOP) has developed a practical clinical definition and consensus diagnostic criteria for age-related sarcopenia, endorsed by several European medical societies. Sarcopenia is defined as a syndrome characterized by progressive and generalized loss of skeletal muscle mass and strength, leading to adverse outcomes such as physical disability, poor quality of life, and increased risk of death. The group recommends using both low muscle mass and low muscle function (strength or performance) for diagnosis. They propose conceptual stages of 'presarcopenia', 'sarcopenia', and 'severe sarcopenia' to guide clinical management. Various measurement techniques for muscle mass, strength, and physical performance are reviewed, with recommendations for their use in research and clinical practice. Cut-off points for diagnosis are based on normative populations, and an algorithm for case finding in older individuals is suggested. The ultimate goal is to identify dietary strategies, lifestyle changes, and treatments to prevent or delay the onset of sarcopenia.