Do you gain the ability to pre-ejaculate before being able to ejaculate?
Not necessarily. Pre-ejaculate is produced by the Cowper’s glands and semen is produced by seminal vesicles. Which of the two sets of glands mature first depends on your genetics. Some boys start dripping pre-ejaculate fluid when they are aroused before they are able to ejaculate semen. Other boys ejaculate semen first and then start dripping pre-ejaculate fluids when aroused at a later time.