A traditional quinceañera celebration takes place when a girl turns 15.
The custom marks an important birthday and traditionally symbolizes a transition from childhood toward young womanhood. The word quinceañera can refer both to the celebrant and, in common English usage, to the celebration associated with her fifteenth birthday.
The observance varies considerably by family, country, religion, and budget. Some families organize a Catholic Mass followed by a reception, while others hold only a secular party. Formal clothing, music, dancing, speeches, and a large family gathering are common features, but none is required everywhere.
The tradition should not be confused with a universal legal change at age 15. In most countries, turning 15 does not itself confer adulthood, voting rights, or a particular legal status. It is primarily a cultural and family milestone whose meaning has evolved as celebrations have spread internationally.