Section 9(1)(b) in Mizoram (Finance and Accounts Service) Rules, 1991
(b)Age. - He must have attained the age of 21 years but must not have exceeded the age of 27 years on the first day of the year of advertisement; provided that the upper age limit may be relaxed by 5 years in the case of candidates belonging to Scheduled Castes and Scheduled Tribes and in respect of candidates belonging to special categories in accordance with any general or special order issued by the Government from time to time.