How Old Is Monkey D Luffy in the Promised Neverland

It appears there might be a misunderstanding in the premise for this Super Pillar hub. Monkey D. Luffy is the iconic main protagonist of the manga and anime series One Piece, created by Eiichiro Oda. He is not a character in The Promised Neverland, which is a distinct manga and anime series created by Kaiu Shirai and Posuka Demizu, featuring its own unique cast of characters like Emma, Ray, and Norman....