Section 41(2)(a) in Bihar Juvenile Justice (Care and Protection of Children) Rules, 2015
(a)Observation Home or Place of Safety:(i)Separate observation homes for girls and boys;(ii)Classification and segregation of juveniles according to their age group preferably 7-11 years, 12-15 years and 16-18 years, giving due consideration to physical and mental status and the nature of the offence committed.