How long a 70-year-old can live without chemotherapy needs to be assessed according to the type of cancer, clinical staging, degree of differentiation of the tumor and other factors, ranging from a few months to a few years. If the malignancy of the tumor is low, the differentiation degree is high, and there are no multiple metastases in the early stage, for example, early papillary thyroid cancer, prostate cancer, etc., it is possible to achieve clinical cure without chemotherapy after complete resection of the tumor by surgery and the survival time is longer. If the malignancy of the tumor is high and multiple metastases have occurred, for example, advanced pancreatic cancer, coupled with the patient’s age, the survival time is about a few months, and chemotherapy has little effect on prolonging the survival time. Cancer patients should actively cooperate with doctors and prolong the survival period as much as possible under doctors’ treatment.