Hello Aspirant,

You can definitely fill an application form for UPSC 2023 if you are going to complete your graduation by August 2023 and the eligibility date is considered as August 1st so by August 1st, 2023 you will have passed your 21 years of age so you will be eligible for UPSC 2024 because minimum age limit for the examination is 21 and maximum is 32 years.

For your reference following age relaxation as per the reservation criteria of UPSC is also mentioned :-

>>>> OBC - 3 years

>>>> SC/ ST - 5 years

>>>> Defense Services Personnel, who got disabled during operations during hostilities with any foreign country or in a disturbed area and released as a consequence - 3 years

>>>> Ex-servicemen including Commissioned Officers (CO) and ECOs/ SSCOs who will render at least five years Military Service as of August 1, 2021, and have been released - 5 years

ECOs/SSCOs who have completed an initial period of assignment of five years of Military Service as of 1st August 2021 - 5 years

>>>> In the following cases: blindness and low vision, deaf and hard of hearing, locomotor disability including acid attack, cerebral palsy, leprosy cured, dwarfism, victims and muscular dystrophy, intellectual disability, autism, specific learning disability and mental illness - 10 years

>>>> Candidates ordinarily domiciled in the State of Jammu & Kashmir from January 1, 1981, to December 31, 1989. - 5 years

You can check out the detailed eligibility criteria for UPSC IAS from the link given below :-

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

I hope this information helps you.

Good Luck!!