Section 25(2)(a) in Tamil Nadu Juvenile Justice (Care and Protection of Children) Rules, 2017
(a)observation home and special home.-(i)separate homes for girls and boys;(ii)classification and segregation of children 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;(iii)students alleged to have either committed or been party to heinous crimes shall be provided separate accommodation within the Home.