I might be wrong - but, I'm guessing that no one reading this blog has heard of "Mr. de Marathon" before. The only reason I know anything about him is that he is in Noakes' book "Lore of Running." But, he won the Boston marathon a record 7 times and ran it 33 times - the last time at the age of 65. Some of the years he won had some soft times, but he ran a 2:18 in 1922 - no easy jog. DeMar only won the Boston marathon once during the ages of 22-33 because he had been told he had a heart problem and that as a strict Baptist he believed that the desire for "selfish victory" was immoral. So, maybe there is some hope for us "old men."
The one quote I found for him was "Run like hell and get the agony over with."
His training doesn't seem to have consisted of much quality work - it was mostly 100 mile weeks with 20 mile runs as his main run for the week. Speed work mostly came from 10 mile races.