Dear student,
Minimum age limit for UPSC Civil Services Exam is 21 years and maximum age limit is 32 years for General Category candidates. There is 3 year relaxation on upper age limit for OBC Category candidates and 5 years for SC/ ST category candidates.
You will be eligible for UPSC Civil Services Exam in 2023. Now you are 19 years and next year you will be 20 years. So, you will be eligible for UPSC Civil Services Exam in 2023 as you'll be 21 years old before 1 st of August, 2023.
Along with that you must have passed Graduation from a recognised College or University or be in final year of Graduation from a recognised College.
For more information about UPSC IAS eligibility criteria go through below mentioned link.
https://competition.careers360.com/articles/upsc-ias-eligibility-criteria
UPSC CSE is conducted in 3 stages
Prelims exam : Objective paper
Mains exam :Descriptive /Written exam
Personal Interview : Personality Test
To get more information about UPSC IAS syllabus go through below mentioned link.
https://competition.careers360.com/articles/upsc-ias-syllabus
You can check UPSC IAS exam paper pattern, using below given link.
https://competition.careers360.com/articles/upsc-ias-exam-pattern
May this information was helpful to you.
All The Best!!