NEXT exam has been proposed in 2019 with an estimated implementation year of 2021-22. And the rules or guidelines haven't been officially released yet. So we do not have concrete information regarding this. There might be no upper age limit as is the case for both NEET and NEET PG. But we still need to wait to hear from MCI or NMC to check the rules and guidelines for NEXT exam whenever it might be conducted.