Kevin Costner’s Yellowstone co-star recently revealed that Costner requested he dye his gray hair for one specific reason: to look younger on screen. According to the co-star, Costner felt that darker hair would help maintain the character’s rugged and resilient look, aligning with the strong and youthful presence the show’s storyline required. Despite initial reservations, the actor agreed to the change, recognizing the importance of visual continuity in bringing authenticity to the Yellowstone world.