Section 110(2) in The Delhi School Education Rules, 1973
(2)[ Notwithstanding anything contained in sub-rule (1), every teacher, laboratory assistant, librarian. Principal or Vice-Principal employed in such school shall continue to hold office until he attains the age of 60 years:] [For details kindly see Notification No. F. 5/15 15/72 Edn. 538-2037 dated 29.1.1985, F.5-84/85 UTI Ministry of Education Department of Education 28.4.1984, F.5-228/83 UTI Ministry of Education dated Ed. 6.9.1983 & F/ACT/2876-3676 of Education dated 30.6.1989.]Provided that where a teacher. Principal or Vice Principal attains the age of superannuation on or after the 1st day of November of any year, such teacher, Principal or Vice Principal shall be re-employed upto the 30th day of April of the year immediately following.