What episode does naruto become an adult?

Naruto officially becomes an adult in "Naruto: The Last Movie," which takes place after the events of the "Naruto" series and its sequel, "Naruto: Shippuden." In terms of episodes, he is depicted as an adult in the epilogue of "Naruto: Shippuden," specifically in the final episode, Episode 500, where he is shown as a grown-up alongside other characters. The movie and the final episode highlight his growth and development into a mature ninja and leader.