This is the progression of world record improvements of the 400 metres W75 division of Masters athletics.
Key
HandAutoAthleteNationalityBirthdateAgeLocationDateRef1:17.71Michelle Peroni-Edoh7 August 1947Pescara26 September 20231:15.21Michelle Peroni-Edoh7 August 1947Laval24 June 20231:19.53Christa Bortignon29 January 1937Kamloops22 August 20131:21.28 Jeanne Daprano16 September 1936Bloomington16 March 20121:24.89 Emma Maria Mazzenga1 August 1933Ancona25 March 20091:25.07Christa Bortignon29 January 1937Saint John9 August 20121:25.40Suzi MacLeod7 December 1933Sacramento22 July 20101:25.50Audrey Lary9 May 1934Palo Alto5 August 20091:26.66Åse Nyland4 May 1933Greveskogen17 August 20081:27.70Monica Shone5 February 1926Hendon27 July 20021:28.42Paula Schneiderhan16 November 1921Gateshead7 August 19991:29.62Polly Clarke17 July 1910Indianapolis25 August 1985
References
Masters Athletics 400 m list