Monkey D Luffy’s age in Season 1 is 17 years old. He is the main protagonist of the popular anime and manga series known as One Piece. He is the captain of the Straw Hat Pirates, a group of powerful and adventurous pirates.
Luffy’s signature technique is the Gum-Gum fruit, which is what allows him to stretch his body like rubber. He was initially inspired to become a pirate by Shanks, a pirate captain who gave Luffy his iconic straw hat.
Initially, Luffy’s age was kept a mystery but it was eventually revealed that the Straw Hat Pirate captain was 17 years old in the first season of the show.