World Health Organization (WHO) defines adolescence as a stage of life between 10 to 19 years old, "a unique stage of human development" (Adolescent Health, 2023). While some language teachers or instructors are very keen on teaching learners in this age group, others find working with teenage learners not an easy task and yet challenging (Harmer, 2007 as cited by de Gentile & de Orue, 2012). For most teenagers, hanging out with their peers is more exciting than being and working in class. "They also generally find it rather difficult to postpone what they find more fun and usually have to make an effort not to fall asleep" (de Gentile & de Orue, 2012). The root of these puzzling teenage behaviors may lie in the maturing development of the teenage brain. Through library study, this paper discusses the brain development teenage learners undergo, their needs following this condition, and some useful classroom strategies to accommodate those needs and to improve their motivation and engagement in English class.