Penis length varies from country to country and nation to nation, and is related to age and physical development. Generally speaking, the average length of adult male penis in China is 7.1±1.5cm in the soft state, and 13.0±1.3 in the erect state, which is normal, and the above data is for reference only. Men generally end puberty at the age of 16 to 18, after puberty, the sex organs mature, the penis can not continue to develop. The standard clinical practice for measuring penis length is to use a straightedge to measure the entire length from the pubic symphysis to the tip of the penis. It is important to note that people who are overweight or have a hidden penis should try to push away excess tissue and fat in order to measure the exact length of the penis and to prevent inaccurate measurements of the length of the penis. If you have an abnormality in the development of your penis, please seek medical attention.