How long you can live with fatty liver at the age of 30 is related to the presence of liver damage, that is, to the liver biochemical indicators, the severity of the disease and the treatment. In the case of simple fatty liver, the liver biochemical indicators have been normal and the disease progresses slowly, which usually does not affect the life expectancy. In the case of steatohepatitis, the liver biochemical indexes are elevated, and if the patient is not given attention and treatment, the disease can further progress to cirrhosis and liver cancer, and the patient’s life expectancy will be affected, and the specific life expectancy varies greatly among individuals. If the patient can give active treatment to keep the liver biochemical indexes in the normal range and the disease progresses slowly, the life expectancy is generally not affected. Patients with simple fatty liver do not need liver-protective treatment for the time being, but they need to be reviewed regularly. Attention is also paid to life interventions that address the cause of the disease. If not taken seriously and continues to progress, it can develop into steatohepatitis. Patients with steatohepatitis generally need liver-protective therapy, and liver biochemistry can be restored to normal with the general application of liver-protective and enzyme-lowering drugs. Along with liver-protective therapy, lifestyle interventions need to be taken in conjunction with the cause of the disease. For example, people with high blood lipids and obesity need to pay attention to weight loss, adopt a high-protein, low-fat diet, and increase exercise appropriately. If alcohol consumption is the cause, strict abstinence from alcohol is required. After taking etiological treatment, liver-protective and enzyme-lowering drugs can be safely discontinued only after the fatty liver disappears. If the fatty liver still exists, the liver biochemical indexes will rise again several months after stopping the liver-protective and enzyme-lowering drugs. Therefore, once liver damage occurs, liver-protective drugs need to be applied in a timely manner, along with active lifestyle interventions. Prevent steatohepatitis from developing into liver fibrosis, cirrhosis or even liver cancer, to the extent that it eventually affects the patient’s life expectancy.