Boys are generally likely to reach puberty after the age of 14, when male secondary sexual characteristics begin to develop. Generally between the ages of 10-11 the testicles gradually begin to increase in size, at the age of 12-13 the prostate gland begins to develop and begin to secrete prostatic fluid, and the laryngeal nodes can appear to increase in size. At the age of 13-14, the penis will obviously begin to enlarge, grow, thicken, etc. At the age of 14-15, some body hair will grow, such as armpit hair, pubic hair, etc., and some whiskers will begin to grow, and at this time, some people will experience spermatorrhea. By the time 17-18 years old, the development of boys will begin to slow down, and begin to tend to adulthood, most of them after 18 years old, adulthood basically does not develop.