According to Official Guinness Records,
The longest career as an actress is 86 years and was achieved by Dercy Goncalves (Brazil, b. 26 June 1907) who ran away from home and joined a travelling theatre in 1922 and acted on stage, in television and film until 2008 when she starred in the film Nossa vida nao cabe num opala at the age of 101. Dercy Goncalves sadly died on 19 July 2008, the much-celebrated actress was commemorated by a host of Brazilians including current President Luiz Inacio Lula da Silva. Despite being just 4 ft 11 in height she had a reputation for causing a big scene and even declared in 2007 that nobody was happier than her.
For a complete list of 2008 records, please visit 2008 Guinness Records in Brazil.