(in the UK) a criminal from 18 to 20 years of age.
 Example sentencesExamples
-  Across regions, young adult offenders are turning over at the greatest rate in federal institutions.
 -  A new strategy to improve the way prisons handle young adult offenders was called for by the jails watchdog today.
 -  The young adult offenders are assigned to a young adult offenders facility.
 -  In 2004, it was estimated that the costs of crime attributable to young adult offenders was £19.2 billion.
 -  The Prison Service has tried to mix young adult offenders in with older criminals in the system.