According to Official Guinness Records,
The oldest Olympic gymnast (female) is Oksana Chusovitina (Uzbekistan) who at the age of 41 years 56 days competed at the 2016 Olympic Games, in Rio de Janeiro, Brazil, on 14 August 2016.Throughout Oksana's gymnastics career she has competed at a record-breaking seven consecutive Olympic Games. She has represented the Unified Olympics team (1992), Germany (2008 and 2012), and Uzbekistan (1996-2004 and 2016).
For a complete list of 2016 records, please visit 2016 Guinness Records in Brazil.