Characters in these stories defy the laws of time, possessing physical forms that contradict their true years. Whether it is a thousand-year-old cultivation grandmaster maintaining the face of a teenager or a reincarnated emperor trapped in a child's body, this tag explores the dynamic between inner maturity and outward perception. Common tropes include hidden experts living as recluses, loli-faced ancestors with terrifying strength, and the classic 'pig eating a tiger' scenario. Readers are drawn to these novels for the inevitable identity reveals and the immense satisfaction of seeing arrogant antagonists underestimate a protagonist who is far more experienced than they appear. From comedic misunderstandings to high-stakes political intrigue, the contrast between appearance and age adds a layer of mystery and strategic depth to every encounter.