It was written by Ashley Grace, Hanna Nicole, Geoffrey Rojas, Erika Ender and Andy Clay.

[11][12] In Mexico, the song peaked at number one on the Mexican Singles Chart, and Monitor Latino.

[20] Ha*Ash performed "100 años" for the first time at "The Voice Spain" in December 2017.

On February 24, 2018, the duo appeared on Festival Viña del Mar, and also performed "100 Años".

[21] Also in August 2018, the duo appeared on the Mexican Kid Choice Awards and performed the single.