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.
iiagdtr wrote:
Wonder how many geezers here do anything like his training? At some point would faster intervals be of little value as we age?