Eligibility to apply for the UPSC Civil Services Examination is generally based on a few criteria. Primarily, candidates must be Indian citizens, although citizens of Nepal, Bhutan, and certain categories of migrants can also apply. Educationally, applicants must hold a bachelor's degree from a recognized university. Age limits vary, typically set between 21-32 years, with provisions for age relaxations for reserved categories. Furthermore, candidates must not be debarred from any UPSC examination and should meet other specified conditions as per the current notifications issued by UPSC.