young (having lived or existed for only a short time; not old): young children/animals/trees
teenage (between the ages of 13 and 19): We have two teenage children.
teen American informal (teenage): He is now too old for teen parties.
juvenile (relating to young people): Juvenile crime is rising at a very high rate.
junior (relating to young people): The national junior swimming championship will begin earlier this year.
adolescent (of the age when a child is changing into an adult): Parents usually find it hard to understand their adolescent children.
