Greetings,
Yes, you are eligible for the UPSC 2025 exam. For OBC-NCL candidates, the upper age limit is 35 years as of August 1st of the examination year. You were born on July 27, 1990, which means you will be 35 years old on July 27, 2025. This is well within the age limit for the UPSC 2025 exam. Therefore, based on the information provided, you meet the age criteria to apply for the UPSC 2025 exam.

I hope this information helps you.