Unless the context otherwise requires, the definitions set forth in this Section govern the construction of this Chapter: (a) Board means the Territorial Parole Board. (b) Department means the Department of Corrections. (c) Director means the Director of the Department of Corrections. (d) Youth offender means a person of at least eighteen years of age and under the age of twenty-five at the time of conviction. It also means any person certified by the juvenile court for prosecution under 19 GCA § 5105. It shall not mean a person convicted on an offense punishable by life imprisonment. (e) Committed youth offender is one committed for treatment hereunder to the custody of the Director pursuant to Subsection (b) of § 83.35. (f) Treatment means corrective and preventive guidance and training designed to protect the public by correcting the antisocial tendencies of youth offenders. (g) Conviction means the judgment on a verdict or finding of guilty or a plea of guilty, or a plea of nolo contendere.