What is the usual English translation of the Spanish word “quinceañera” when it describes the celebrant?

When quinceañera describes the celebrant, its usual English translation is “fifteen-year-old girl.”

The Spanish word is related to quince años, meaning “fifteen years,” and can refer either to the girl reaching that age or, by extension, to the celebration itself. English-language usage commonly uses quinceañera for both meanings.

The term is feminine because the traditional celebration centers on a girl’s fifteenth birthday. A male celebrant may be called a quinceañero in some contexts, although practices and terminology vary by country and family.

The word does not simply mean “birthday girl,” since the defining idea is the fifteenth birthday and its associated rite of passage. That distinction separates it from ordinary birthday vocabulary.