The document discusses the features of the teenage years. It notes that teenagers experience sharp psychological and physical changes as they transition from childhood to adulthood. This period is difficult as teenagers seek independence but are not fully adults. Teenagers are sensitive to how others see them and experience mood fluctuations. They begin to seek self-education through developing their own beliefs and traits but do not always choose the best paths and may act irrationally in trying to prove themselves. The teenage years are an inconsistent period of identity formation that requires significant effort from parents and others to guide them.