The maximum age limit for general candidates appearing for the UPSC Civil Services Examination is 32 years. This limit is set to ensure a level playing field among aspirants. However, candidates belonging to reserved categories are granted age relaxations, allowing them slightly more time to prepare and gain experience. For example, OBC candidates can often apply until the age of 35, while SC/ST candidates have a limit of 37 years. This age criterion helps to promote inclusivity and diversity in civil services, recognizing varied life experiences.