This is the progression of world record improvements of the 400 metres W55 division of Masters athletics.
Key
HandAutoAthleteNationalityBirthdateLocationDate59.36Julie Brims7 January 1966Brisbane23 January 20211:00.56Marie Mathieu 26 November 1956Porto Alegre26 October 2013 1:01.56Caroline Ann Powell21 December 1953Yeovil9 September 20121:02.34Joylyn Saunders Mullins27 November 1952Lahti28 July 20091:02.40Avril Douglas1 August 1946Toronto25 August 20011:04.2 Anne Stobaus6 July 1941Aberfeldie16 November 19961:04.50Brunhilde Hoffmann17 August 1939Buffalo22 July 19951:05.29Kemisole Solwazi20 October 19398 April 19951:05.48Carolyn Sue Cappetta1936Turku18 July 19911:08.26Josefina Garcia de Schultz14 December 193319901:08.41Irene Obera7 December 1933San Diego20 July 1989
References
Masters Athletics 400 m list