This is a time of changes for how teenagers think, feel, and interact with others, and how their bodies grow. Most girls will be physically mature by now, and most will have completed puberty. Boys might still be maturing physically during this time. Your teen might have concerns about her body size, shape, or weight. Eating disorders also can be common, especially among girls. During this time, your teen is developing his unique personality and opinions. Relationships with friends are still important, yet your teen will have other interests as he develops a more clear sense of who he is. This is also an important time to prepare for more independence and responsibility; many teenagers start working, and many will be leaving home soon after high school.