my dob is 17 April, 2003 . am I eligible for the exam , if i start to prepare now in June 2022 can i prepare well for upsc June 2024

Hello Aspirant,
Yes you will be eligible for UPSC 2024 as per the current eligibility criteria. 

Because as per your Date of Birth your age in 2024 would be 21 years and the age limit for UPSC IAS exam is 21 year to 32 year with following age relaxation as per the reservation criteria of UPSC :-

>>>> 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
>>>> So as per the age criteria you are eligible for UPSC IAS exam 2024 because the candidate should have crossed age of minimum 21 years on the August 1st of examination year.

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

See UPSC examinations are some of the toughest examinations for public services and if you are starting now with around 2 years left, you should maintain a good pace and be consistent then you can definitely crack UPSC 2024 with your hard work and determination. 

I hope this information helps you.
Good Luck!!