Beatriz Teodora Pirelli Zanandrea was born in the Florida Department, Uruguay, on 19 September 1910. Her parents were Pedro Pirelli (son of Giorgio Pirelli, an immigrant from Italy) and Mariana Zanandrea (from Argentina); who met because their respective families had come together on the trip from Italy. Her parents got married when her mother was just 13 years old. She had 10 siblings.

On 7 September 1929, she married Félix María Cabrera. The couple had two children: Diego Abaroré and Tabaré. In 1938, she moved to Montevideo City. She worked as a seamstress, together with her sister Nelly Pirelli.

Pirelli Zanandrea had three grandchildren: Adriana, Diego and Alexander; and 9 great-grandchildren. She outlived her two children and two of her three grandchildren who died at a young age.

Pirelli Zanandrea died in Montevideo, Uruguay on 6 July 2021 at the age of 110 years, 290 days.