The survival period of 75-year-old people with early lung cancer under conservative treatment is between 3~5 years, while that of advanced patients is mostly 3~6 months, and some patients can reach 1~3 years. Early stage lung cancer cells do not have metastasis and spread and are limited, so chemotherapy and radiotherapy can help inhibit the replication of cancer cells and keep the condition stable, and the survival time can reach 3~5 years; if the patient meets the requirements of surgery, it is still recommended to undergo radical surgical resection in time, which will have a more prominent therapeutic effect. If advanced lung cancer is accompanied by metastasis and spread of lymph nodes and distant organs, the survival time of most of the conservative treatments is only 3~6 months, but it can be extended to 1~3 years if targeted drugs are available.