As people age, loss of muscle mass is inevitable, resulting in sarcopenia. Muscle loss contributes to overall weakness, which causes frailty. Frailty, in turn, is the generalized susceptibility to disease and injury, all of which causes loss of autonomy. Because of the potential for progressive decline in physical function in very elderly patients, accurate tools are needed to predict mortality risk to individualize treatments intended to improve longevity such as chemotherapy, management of chronic diseases, and surgery. In this podcast, sarcopenia, frailty, and risk prediction are discussed in the context of major trials studying them being conducted in Europe.