As Kids Health explains, males don't have a menstrual cycle like females due to the differences in their reproductive systems. During puberty, boys experience other physical changes that are significantly different.
Women's Health explains that when girls reach puberty, the bloody lining of the uterus is shed for the first time. Since the uterus is a female reproductive organ, only girls experience periods.
According to Kids Health, boys experience other changes during puberty, including hair growth, deepening of the voice, increased height and muscle growth due to increased levels of testosterone in the body. The website specifies that these changes typically occur between the ages of 9 and 14 but can begin and end earlier or later.