He later extended this record, running a time of 2:58:40 at the age of 74. At 73, he set a world record in the marathon for men 70 to 74, running a 2:54:48, when he was 73, and his fastest time after turning 70. According to an article in "The New York Times", if age-graded, this time would be equivalent to a 20-year-old running 2:03:57 and which would have been the fastest marathon ever run in 2010. For an explanation of age-graded tables, see masters athletics. At the time of his death, Whitlock he was still the only person over 70 to run a marathon in less than three hours. 