The average length of the diameter of the prostate at the age of 60 years does not exceed 4 centimeters is normal, but there are individual differences, and no generalizations can be made. When the length of the diameter of the prostate is more than 4 centimeters, the diagnosis of prostate enlargement is made. The size of the prostate is usually measured by ultrasound. The shape of the prostate is similar to a sphere, with an upper transverse diameter of about 4 centimeters, a vertical diameter of about 3 centimeters, and an anterior-posterior diameter of about 2 centimeters. As we age, the number of cells in the prostate gland gradually increases and the size of the gland increases. The increase in size gradually affects the urethra, causing symptoms such as thinning or obstruction of the urethra, resulting in weakness and difficulty in urination. Prostate enlargement is diagnosed when the diameter of the prostate exceeds 4 centimeters in length. Therefore, it is normal for the prostate to be no longer than 4 centimeters in diameter at the age of 60. If the length of the prostate is found to be more than 4 centimeters and accompanied by symptoms in the lower urinary tract, it is recommended to go to a regular hospital for timely treatment to avoid causing difficulties in life.