This is the progression of world record improvements of the 300 metres hurdles M65 division of Masters athletics.
Key
HandAutoAthleteNationalityBirthdateLocationDate43.88 Guido Müller 22.12.1938 Arhus 25.07.2004 45.20Jack Greenwood 05.02.1926 Turku 25.07.199147.82 Arne Pettersson 24.03.1923 Verona27.06.1988 50.63Bob Hunt Uniondale 19.07.1986
References
Masters Athletics 300 m hurdles list