I've been training like him for about three months. Most of my aches and pains have gone away and I have essentially doubled my mileage.
The biggest opponent to 60+ runners is injury. You can train 95% of your potential while reducing injuries at least by that much simply by slow steady running and a brief sharpening using races and a few faster sessions. That may be Ed's strongest contribution to masters running, aside from his remarkable genetics.
Wonder how many geezers here do anything like his training? At some point would faster intervals be of little value as we age?
How do you calculate that "95% of your potential"? Not disputing it as it sounds about right if a little high. Running at that level as an older running would be great.