Surgical resection is the primary and most effective treatment for cancer patients. While such a traumatic intervention often accompanies different degrees of postoperative risk largely depending on the patient's health status. Due to the high prevalence of malnutrition or low cardiorespiratory fitness in elderly cancer patients, prehabilitation is an optimal program to reduce postoperative complications and enhance recovery from surgical trauma. An increasing body of evidence suggests that improving nutrition and taking aerobic exercise or strength training prior to major surgery can help reduce postoperative morbidity, mortality, or length of stay. However, there are still controversies regarding the manner, intensity, or duration of preoperative nutrition and exercise training in elderly patients, as well as the impact on delaying cancer treatment. This article reviews the impact of prehabilitation on improving postoperative outcomes in the multi-modal or single-modal pathway, aiming to maximize its effectiveness and increase medical practitioners' attention on enhancing the physical condition of the elderly cancer patients preoperatively.