As per the eligibility The candidate must not be more than 22 years of age as on 1 July 2019. Ideally, the date of birth of the candidate should fall on or after 1 July 1997, As a OBC category There is a relaxation of three years in the upper age limit. You can check the further information with the given below link.

https://university.careers360.com/articles/bhu-uet-eligibility-criteria

Good Luck!