This is the progression of world record improvements of the 300 metres hurdles M70 division of Masters athletics.
Key
HandAutoAthleteNationalityBirthdateLocationDate45.24 Guido Müller 22.12.1938 Vaterstetten 10.07.200949.07 Earl Fee 22.03.1929 Orlando28.08.199950.07 Tor Trondset 16.11.1935 Riccione04.09.200750.22 James Stookey 20.01.1930 San Diego 17.08.200050.4 Albertus Van Zyl 13.08.1922 17.04.199352.44 Daniel Bulkley 04.05.1917 Eugene03.08.1989 53.98Gilberto Gonzalez Uniondale 19.07.1986
References
Masters Athletics 300 m hurdles list