To be eligible for the Data Entry Operator (DEO) position under the Mid-Day Meal recruitment in Birbhum district, candidates must be between 21 to 40 years of age as of the closing date of application. The upper age limit is relaxed by 5 years for candidates belonging to the Scheduled Caste (SC) and Scheduled Tribe (ST) categories, and by 3 years for candidates from the Other Backward Class (OBC) category. Candidates are advised to carefully check the age eligibility criteria before applying for the DEO vacancies.