Dear Aspirant,

Candidates for the UPSC must be at least 21 years old and cannot be older than 32. EWS & General Category: 32 years; 6 tries. OBC (with certificate): 32 years and 3 additional years; nine tries. 32 years plus five years; unlimited tries for SC/ST. But as per your age you will not be able to apply for upsc in 2025 because your age will be 20 not 21.

You can refer this link for more information

https://competition.careers360.com/articles/upsc-ias-eligibility-criteria

Hope this helps

Good luck!