Schoolboy/ˈskuːlbɔɪ/ Definition 1 of 2Pro Tip 1/3Age Specific The word 'schoolboy' refers to boys of a certain age, typically under 18. After turning 18, he was no longer a schoolboy. Pro Tip 2/3Currently Enrolled 'Schoolboy' implies that the boy is currently attending school. The schoolboy lost his textbooks on the way home. Pro Tip 3/3Not for Adults Avoid using 'schoolboy' when referring to adult learners or education environments. My uncle is taking a class, but he's not a schoolboy.