Chang Kuo is a Chinese word that refers to longevity or eternal youth in traditional Chinese culture. This term is well-known in Chinese mythology and literature. However, there are synonyms to describe this concept, such as "Shou Xing," which translates to "the god of longevity" and represents the concept of immortality and long life. Another synonym is "Taoist alchemist" who is believed to have the knowledge and ability to create an elixir of youth that can grant eternal youth. "Xian" is also another synonym which means "immortal" or "transcendent" in Chinese culture. These synonyms express the fascination and desire for living a long, healthy, and fulfilling life that has been present in Chinese culture for centuries.