How long a normal person can live after donating a kidney is related to his or her own constitution, daily care after kidney donation, etc. It is impossible to make a generalization. Before donating a kidney, a very comprehensive and detailed examination is usually required, including mating, heart and lung function, liver and kidney function, blood system function, and metabolic disease examination, and only when there is no problem can the person donate. If the donor kidney is donated through the regular way, the other kidney left behind can meet the needs of the body and maintain the normal metabolism of daily life through compensation if it functions normally, and it will not have much impact on life expectancy and can survive for a long time. However, after the age of 40, the kidney will naturally age by 1% every year. Therefore, it is recommended to review urine routine and kidney function regularly, and if early kidney lesions are found, the primary disease should be actively treated, protein intake should be controlled, and Chinese medicine treatment should be received to protect kidney function. After kidney donation in normal people, diet needs to be low salt and low fat, avoiding large amount of high protein food and nephrotoxic drugs to protect the kidney function on the remaining side.