This is the progression of world record improvements of the 400 metres W35 division of Masters athletics.
Key
HandAutoAthleteNationalityBirthdateLocationDate49.46Allyson Felix18 November 1985Tokyo6 August 202149.89Allyson Felix18 November 1985Tokyo4 August 202150.02Allyson Felix18 November 1985Eugene, Oregon20 June 202150.14Novlene Williams-Mills26 April 1982Kingston, Jamaica25 June 201750.27Jearl Miles Clark4 September 1966Madrid20 September 200250.37Jearl Miles Clark4 September 1966Monaco19 July 200250.45Jearl Miles Clark4 September 1966Rethymno7 July 200250.45Jearl Miles Clark4 September 1966Palo Alto8 June 200250.56 Aurelia Penton18 February 1943Medellín15 July 1978
References
Masters Athletics 400 m list Women's all time 400 list