A person who is or, in the absence of evidence to the contrary, seems to be twelve years of age or older but under eighteen years of age. Section 2(1) of the YCJA specifies that “if the context requires [young person] includes any person who is charged . . . with having committed an offence while he was a young person or is found guilty of an offence under this Act.” That is, even if a person has passed his or her eighteenth birthday, for most purposes, the person alleged to have committed an offence while a young person will continue to be treated under the YCJA for purposes of prosecution, sentencing, and sentence review.