The Spanish term for the girl celebrating her 15th birthday is quinceañera.
The feminine noun refers both to the celebrant and, by extension, to the celebration associated with her fifteenth birthday. In English-language usage, “quinceañera” commonly names the event itself as well as the young woman being honored.
The masculine form quinceañero can refer to a boy’s comparable fifteenth-birthday celebration, although the tradition is more widely associated with girls. Usage varies across countries and families.
Quinceañera is written with the ñ, the Spanish letter formed with a tilde. English texts sometimes omit the accent or use “quince anos,” but quinceañera and quince años are standard Spanish expressions for the tradition.