England and Wales - no legal provision | Depending on their profile, children under 18 (‘juveniles’) can be detained in several kinds of establishments, but only Young Offenders Institutions can detain both boys and male adults. Although they can be held in the same establishments, juveniles are strictly separated from adults at all times. In England and Wales juvenile prisoners are boys aged 15-18 and young adults aged 18-21. |
Scotland - No legal provision | Juveniles are detained in Young Offenders Institutions. Juveniles are generally held separately from adult prisoners unless mitigating circumstances dictate otherwise. In Scotland juvenile prisoners are boys and girls aged 16-21. |
Northern Ireland - no legal provision | Juveniles are no longer detained within adults’ prison since 2012. Juveniles are detained in separate Juvenile Justice Centres. |