'Shòu xīng' literally combines 'shòu' (longevity, lifespan) and 'xīng' (star), originally referring to the ancient Chinese deity personifying long life — often depicted as an old man with a high forehead, holding a staff and a peach. This celestial figure is one of the 'Three Stars of Good Fortune' (alongside Fu Xing and Lu Xing) and appears frequently in traditional art, especially during birthdays and New Year celebrations.

In modern spoken Chinese, 'shòu xīng' is commonly used informally to refer to the birthday person — the 'star of the day' whose longevity is being celebrated. It carries warm, affectionate, and slightly playful connotations, especially among family and friends. While rooted in mythology, its everyday use emphasizes joy, respect for age, and communal celebration rather than religious belief.