In the United States, you are considered an adult at 18. With age comes a host of other privileges. You can drive at 16 with a proper driver's license, have sex at 17, vote and purchase cigarettes at 18, and purchase and consume alcohol at 21. Although there is an age limit that is not set in stone. In the justice system you can be considered an adult at 18 and be tried as such. Whether you can be tried as an adult depends on many circumstances. If the individual committed a serious crime, such as armed robbery, rape, or murder, he or she could be tried as an adult. If the individual was tried as an adult in a previous case, he or she will continue to do so indefinitely. The prosecutor or judge may be given the opportunity to choose how they want the individual to be tried. Maturity level may play a role. There are so many conditions that can lead to trying Bing as an adult. This is where science comes in. Cognitive development, to be precise. Cognitive development is the study of the ability to think and understand. It's a nervous field...