This is the progression of world record improvements of the 300 metres hurdles W55 division of Masters athletics.
Key
HandAutoAthleteNationalityBirthdateAgeLocationDate46.74Barbara Gähling20 January 1965Köln8 May 202247.46Barbara Gähling20 January 1965Solingen12 June 202148.74Susan Frisby9 April 1960Aarhus3 August 201749.00Jane Horder18 January 1957Derby21 July 201249.14Phil Raschker21 February 1947Orono11 August 200252.11Corrie Roovers14 July 1935Turku26 July 199155.40Wanda Sakata Dos Santos1 June 1932Eugene3 August 1989
References
Masters Athletics 300 m hurdles list