The eligibility criteria regarding age for UPSC aspirants typically stipulate that candidates must be between the ages of 21 to 32 years. However, there are age relaxations for certain categories, including SC/ST and OBC candidates, allowing them additional years of eligibility. Aspirants must also meet the educational qualifications, which generally require a graduate degree from a recognized institution. Awareness of these criteria is essential for candidates to strategize their preparation timeline effectively.