The identification of benign and malignant lung nodules is related to their size, shape, development speed, etc. The correlation with the patient’s age is low, and it is impossible to judge the chance of benign lung nodules in 70-year-old people, so it is recommended that the patient improve the relevant examinations, such as lung CT, and if necessary, carry out pathological biopsy to clarify the nature of the nodules. Lung nodules are a common type of lung disease in clinical practice and can be categorized as benign or malignant according to the nature of the nodules. Benign nodules are relatively small, slow to develop, and uniform in shape, while malignant nodules are relatively large, fast to develop, and irregular in shape. The probability of benign or malignant nodules cannot be inferred from age alone, and patients are advised to undergo further tests to clarify the nature of the nodules. Pathological biopsy is the best way to diagnose the nature of lung nodules. If the patient has a long history of smoking or a family history of lung malignancy, it is recommended that the patient undergoes a biopsy as soon as possible to clarify the nature of the lung nodule, so that appropriate treatment can be carried out in a timely manner.