How Old Is Monkey D Luffy in Demon Slayer

Let's cut right to the chase: Monkey D. Luffy, the beloved protagonist of One Piece, does not appear in Demon Slayer. While both series are global anime and manga sensations, they exist in entirely separate universes with distinct characters, settings, and lore. So, if you're wondering how old Monkey D. Luffy is in Demon Slayer, the answer is he isn't there at all! In his own world of One Piece, Luffy begins his grand adventure at the age of 17....