I hope you are doing well, about your question, if you are born in 1999 that means by now u will attain 21 years of age so yes u are eligible to apply for SBI PO
Date of Application Form is from April 2020 ( tentative)
Educational Qualification is Graduation or any equivalent degree
Age limit is between 21 to 30 years
Age Relaxation for:
SC/ST- 5 years OBC (NCL)- 3 years
Number of attempts: UR/EWS –4 OBC- 7 SC/ST –
Hope this helps!!