The length of the penis of a 13-year-old male is generally between 2.5 and 3.3 centimeters, because 13-year-old males are in puberty, the sex organs are not yet fully developed, so the length of the penis will be very different, some of them develop earlier, the penis may reach 5 centimeters, or it may not be very long, generally is a normal physiological phenomenon. 13-year-old male, penis length is not fixed, because the development of each male sooner or later, the body’s sex hormone secretion status is different, so the development of the sexual organs of the speed of the difference exists. You can continue to observe the development of the penis, if there is an abnormal situation, you can go to a professional male hospital in time.