In the eyes of the law, things change once your child is of legal age. Most teens turn 18 during their senior year of high school, when the majority of year-olds are still supported by their parents and living at home. While you may still see a child who leaves socks on the floor and forgets to take out the trash, your child is now legally an adult. Ben Luftman is a criminal defense attorney in Columbus, Ohio who has seen many year-old potential clients walk through his doors. Once your child has turned 18, she will be charged as an adult for even minor offenses.