| 2007 age | 2018 age | |||||
| factors | factors | |||||
| Age | Year | Actual | Predicted | Difference | Predicted | Difference |
| 40 | 1994 | 20:52 | 18:34 | 2:18 | 17:46 | 3:06 |
| 41 | 1995 | 20:15 | 18:42 | 1:33 | 17:57 | 2:18 |
| 42 | 1996 | 20:11 | 18:52 | 1:19 | 18:08 | 2:03 |
| 43 | 1997 | 21:29 | 19:00 | 2:28 | 18:18 | 3:11 |
| 44 | 1998 | 20:34 | 19:10 | 1:24 | 18:29 | 2:05 |
| 45 | 1999 | 22:05 | 19:20 | 2:45 | 18:40 | 3:25 |
| 46 | 2000 | 21:36 | 19:28 | 2:08 | 18:51 | 2:45 |
| 47 | 2001 | 21:03 | 19:38 | 1:25 | 19:02 | 2:01 |
| 48 | 2002 | 20:58 | 19:47 | 1:11 | 19:14 | 1:44 |
| 49 | 2003 | 21:42 | 19:57 | 1:45 | 19:25 | 2:07 |
| 50 | 2004 | 21:09 | 20:07 | 1:02 | 19:37 | 1:42 |
| 51 | 2005 | 22:04 | 20:16 | 1:48 | 19:48 | 2:16 |
| 52 | 2006 | 21:15 | 20:26 | 0:49 | 20:00 | 1:15 |
| 53 | 2007 | 21:34 | 20:36 | 0:58 | 20:12 | 1:22 |
| 54 | 2008 | 22:13 | 20:46 | 1:27 | 20:24 | 1:49 |
| 55 | 2009 | 21:31 | 20:56 | 0:35 | 20:36 | 0:55 |
| 56 | 2010 | 22:40 | 21:07 | 1:33 | 20:48 | 1:52 |
| 57 | 2011 | 22:17 | 21:16 | 1:01 | 21:00 | 1:17 |
| 58 | 2012 | 21:38 | 21:27 | 0:11 | 21:13 | 0:25 |
| 59 | 2013 | 22:34 | 21:37 | 0:57 | 21:25 | 1:09 |
| 60 | 2014 | 22:33 | 21:47 | 0:46 | 21:38 | 0:55 |
| 61 | 2015 | 22:24 | 21:58 | 0:26 | 21:51 | 0:33 |
| 62 | 2016 | 22:28 | 22:09 | 0:19 | 22:04 | 0:24 |
| 63 | 2017 | 23:48 | 22:19 | 1:29 | 22:17 | 1:31 |
| 64 | 2018 | 22:30 | 22:30 | 0:00 | 22:30 | 0:00 |
| 65 | 2019 | 23:35 | 22:41 | 0:54 | 22:43 | 0:52 |
| 66 | 2020 | 24:00 | 22:53 | 1:07 | 22:57 | 1:03 |
| 67 | 2021 | 23:37 | 23:03 | 0:34 | 23:10 | 0:27 |
| 68 | 2022 | 25:45 | 23:14 | 2:31 | 23:24 | 2:21 |
| 69 | 2023 | 24:15 | 23:26 | 0:49 | 23:38 | 0:37 |
The predicted minimum times were computed using the page: Compute Aging Effects. Both the 2007 and 2018 age factors have been used to see how much difference the new factors make. These calculations are based on an age corrected best time of 22:30 at age 64. This is not Barbara's best time, which is 20:11 at age 42, but it is the best age corrected. Barbara has been close to her line for most of the races, a remarkably consistent performance. She is someone who has slowed down no faster than predicted. This provides support for the regression line in that there are at least some people who can stay on it! Barbara was not that close to the line in the second to last race, age 68, which may in part be due to having had Covid earlier in the year. However, her age 69 time is essentially back on the line, an impressive performance.
Using 22:30 at age 64 as the base, the new age factors predict slightly faster times at the earlier ages. By age 40 the difference is 48 seconds. The big picture is the same, but the new age factors have slightly larger decline rates and thus smaller predicted times for earlier ages. The new age factors say that Barbara should have been able to run a 17:46 at age 40 (and then slowed down faster) compared to 18:43 for the 2007 age factors (and then slowed down slower).