Hi aspirant....!

Hope you're doing great...!

So, with regard of you're query. There is no age restriction   for JEE Main and the Eligibility for JEE 2023 are : A maximum age does not exist. The 10+2 exam or an equivalent exam from a recognized board must have been passed by the candidates. JEE Main 2023 will only accept applications from candidates who passed the 10+2 or equivalent exam in 2021, 2022, or who are sitting for it in 2021.

for more information you can refer the link that I am providing you below:

https://engineering.careers360.com/articles/jee-main-2023#:~:text=JEE%20Main%20Eligibility%20Criteria%202023&text=There%20is%20no%20age%20limit.&text=Candidates%20must%20have%20passed%2010,examinations%20from%20a%20recognised%20board.&text=Candidates%20who%20have%20passed%2010,eligible%20for%20JEE%20Main%202023.

Hope this will helps you...!

GOOD LUCK...!