Did you see this...?
71-year old sets blazing fast mile world record
https://www.runnersworld.com/masters/71-year-old-s...
Yes I've been following the guys progress for some time. Met him at a couple of meets. Interesting training regime but what works for one does not neccesarily work for another. There are/were (think Ed Whitlock) equally or more accomplished masters runners whose training is completely the opposite of this.