A. The essence of puberty is really the development of the ability to procreate (make babies!). By definition, prepubescent boys do not produce sperm, and therefore cannot ejaculate (nor can prepubescent girls ovulate). Over a period of time, the surge in hormones that begins in puberty causes an increase in size and maturity of the testicles, the prostate, and the seminal vesicles (small glands near the prostate). These glands join forces to make semen, and ejaculation becomes possible. This happens, on average, around a boy's fourteenth birthday. The word "average" is important here, since not everyone develops at the same pace--some boys will experience puberty earlier, and for many others it takes a couple more years.
By the time hormones have been increased long enough to allow the production of sperm, acne and sweaty armpits have often also arrived. Not long after that facial hair begins to appear. This is the age when young people take a new interest in their local pharmacy! A trip to the dentist and the ophthalmologist may not be far off either, since at this age nearsightedness can begin and teeth may deteriorate. A visit to the family doctor to talk these things over is a good idea.
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