That is a steep drop in mile pace between ages 50 and 62 you had. Is it just age/genes/luck or did you have some sort of injury in between? Considering that yo

That is a steep drop in mile pace between ages 50 and 62 you had. Is it just age/genes/luck or did you have some sort of injury in between? Considering that you can still do a decent sprint over 400m and have the endurance for ultra marathon distances at lower pace, it sounds a bit odd.