Both amazing performances, but according to the age grading percentage Roberta's was actually quite a bit more impressive!
Roberta Groner, 47: 2:29.32, age-graded score is: 99.28%
Sarah Hall, 41, 2:23.45, age-graded score is: 97.77%
Calculated that to age graded time Roberta was actually 2 minutes faster!
The Womens WR btw is a age-graded score of 104.21%, which should not be possible.
Sarah would have had to run 2:14.52 to achieve same percentage!!!