| Predicted | ||||||
| Minimum | ||||||
| No. | Date | Time | Pace | Age | Time | Difference |
| 20 | September 1, 1997 | 1:48:56 | 8:46 | 40 | 1:21:07 | 27:49 |
| 21 | September 7, 1998 | 1:38:06 | 7:54 | 41 | 1:21:55 | 16:11 |
| 22 | September 6, 1999 | 1:32:11 | 7:25 | 42 | 1:22:44 | 9:27 |
| 23 | September 4, 2000 | 1:37:01 | 7:48 | 43 | 1:23:33 | 13:28 |
| 24 | September 3, 2001 | 1:33:19 | 7:31 | 44 | 1:24:23 | 8:56 |
| 25 | September 2, 2002 | 1:38:19 | 7:55 | 45 | 1:25:13 | 13:06 |
| 26 | September 1, 2003 | 1:34:51 | 7:38 | 46 | 1:26:03 | 8:48 |
| 27 | September 6, 2004 | 1:38:49 | 7:57 | 47 | 1:26:54 | 11:55 |
| 28 | September 5, 2005 | 1:32:41 | 7:27 | 48 | 1:27:46 | 4:55 |
| 29 | September 4, 2006 | 1:29:55 | 7:14 | 49 | 1:28:38 | 1:17 |
| 30 | September 3, 2007 | 1:29:30 | 7:12 | 50 | 1:29:30 | 0:00 |
| 31 | September 1, 2008 | 1:33:32 | 7:32 | 51 | 1:30:23 | 3:09 |
| 32 | September 7, 2009 | injured | - | 52 | 1:31:17 | - |
| 33 | September 6, 2010 | 1:34:04 | 7:34 | 53 | 1:32:11 | 1:53 |
| 34 | September 5, 2011 | 1:35:43 | 7:42 | 54 | 1:33:05 | 2:38 |
| 35 | September 3, 2012 | 1:37:57 | 7:53 | 55 | 1:34:01 | 3:56 |
| 36 | September 2, 2013 | 1:47:49 | 8:41 | 56 | 1:34:56 | 12:53 |
| 39 | September 5, 2016 | 1:41:11 | 8:08 | 59 | 1:37:47 | 3:24 |
| 40 | September 4, 2017 | 1:41:39 | 8:11 | 60 | 1:38:45 | 2:54 |
The predicted minimum times were computed using the page: Compute Aging Effects. The new, 2018 age factors have been used. These calculations are based on Leah's time of 1:29:30 at age 50. This is Leah's personal best time and also her best time age corrected. Leah has been close to her line since age 48, not counting the 2013 race, which had very humid weather.