Abstract: The article of this term paper is about teenagers. You will discover inside the two physical changes that teenagers undergo that are the development of primary and the development of secondary sex characteristics. In addition, you will discover the psychological changes that occur in teenagers which are either due to those physical changes or due to the family (parents and siblings) and the environment (society and culture). Moreover, you are going to get more acknowledged about the different kinds of identities that they develop as they are growing up to become mature adults in addition to many problems that may face them.