The normal value of glomerular filtration rate at age 68 is around 60~90ml/min. Glomerular filtration rate refers to the amount of filtrate produced by two kidneys per unit of time, under normal condition, the glomerular filtration rate is 80~120ml/min. However, the value of glomerular filtration rate has a certain relationship with age, and it decreases at the rate of 1ml/min per year after 40 years old. Therefore, the glomerular filtration rate at the age of 68 is probably around 60 to 90 ml/min. Glomerular filtration rate can assess the condition of kidney function and can help in the diagnosis and treatment of kidney diseases. If the glomerular filtration rate is found to be increased, it is considered to be the early stage of diabetic nephropathy, the early stage of microscopic lesion nephropathy, and pregnant women, etc. If the glomerular filtration rate is decreased, it is considered to be caused by various primary and secondary renal diseases. Patients with abnormal glomerular filtration rate are recommended to consult regular hospitals and standardize treatment under the guidance of physicians.