| Predicted | ||||||
| Minimum | ||||||
| No. | Date | Time | Pace | Age | Time | Difference |
| 6 | September 5, 1983 | 1:26:00 | 6:55 | 40 | 1:09:59 | 16:01 |
| 7 | September 3, 1984 | 1:22:00 | 6:36 | 41 | 1:10:41 | 11:19 |
| 8 | September 2, 1985 | 1:24:00 | 6:46 | 42 | 1:11:23 | 12:27 |
| 9 | September 1, 1986 | 1:27:38 | 7:03 | 43 | 1:12:05 | 15:33 |
| 10 | September 7, 1987 | 1:25:30 | 6:53 | 44 | 1:12:48 | 12:42 |
| 11 | September 5, 1988 | 1:25:20 | 6:52 | 45 | 1:13:31 | 11:49 |
| 12 | September 7, 1989 | 1:20:50 | 6:30 | 46 | 1:14:15 | 6:35 |
| 13 | September 3, 1990 | 1:25:15 | 6:52 | 47 | 1:14:58 | 10:17 |
| 14 | September 2, 1991 | 1:23:30 | 6:43 | 48 | 1:15:43 | 7:47 |
| 15 | September 7, 1992 | 1:24:49 | 6:49 | 49 | 1:16:28 | 8:21 |
| 16 | September 6, 1993 | 1:25:30 | 6:53 | 50 | 1:17:13 | 8:17 |
| 17 | September 5, 1994 | 1:21:30 | 6:33 | 51 | 1:17:59 | 3:31 |
| 18 | September 4, 1995 | 1:19:33 | 6:24 | 52 | 1:18:45 | 0:48 |
| 19 | September 2, 1996 | 1:23:07 | 6:41 | 53 | 1:19:32 | 3:35 |
| 20 | September 1, 1997 | 1:24:20 | 6:47 | 54 | 1:20:19 | 4:01 |
| 21 | September 7, 1998 | 1:24:58 | 6:50 | 55 | 1:21:06 | 3:52 |
| 22 | September 6, 1999 | 1:33:32 | 7:32 | 56 | 1:21:55 | 11:37 |
| 23 | September 4, 2000 | 1:31:20 | 7:21 | 57 | 1:22:43 | 8:37 |
| 24 | September 3, 2001 | 1:27:30 | 7:02 | 58 | 1:23:32 | 3:58 |
| 25 | September 2, 2002 | 1:26:46 | 6:59 | 59 | 1:24:22 | 2:24 |
| 26 | September 1, 2003 | 1:25:38 | 6:53 | 60 | 1:25:12 | 0:26 |
| 27 | September 6, 2004 | 1:26:02 | 6:55 | 61 | 1:26:02 | 0:00 |
| 28 | September 5, 2005 | 1:27:38 | 7:03 | 62 | 1:26:53 | 0:45 |
| 29 | September 4, 2006 | 1:30:38 | 7:18 | 63 | 1:27:45 | 2:53 |
| 30 | September 3, 2007 | 1:31:28 | 7:22 | 64 | 1:28:37 | 2:51 |
| 31 | September 1, 2008 | 1:33:30 | 7:31 | 65 | 1:29:29 | 4:01 |
| 32 | September 7, 2009 | 1:31:51 | 7:23 | 66 | 1:30:22 | 1:29 |
| 33 | September 6, 2010 | 1:32:15 | 7:25 | 67 | 1:31:16 | 0:59 |
| 34 | September 5, 2011 | 1:38:15 | 7:54 | 68 | 1:32:10 | 6:05 |
| 35 | September 3, 2012 | 1:36:56 | 7:48 | 69 | 1:33:04 | 3:52 |
| 36 | September 2, 2013 | 1:42:22 | 8:14 | 70 | 1:33:59 | 8:23 |
| 37 | September 1, 2014 | 1:54:11 | 9:11 | 71 | 1:34:55 | 19:16 |
| 39 | September 5, 2016 | 1:47:08 | 8:38 | 73 | 1:36:48 | 10:20 |
| 42 | September 2, 2019 | 1:53:05 | 9:06 | 76 | 1:39:42 | 13:23 |
| 44 | September 6, 2021 | 2:05:52 | 10:06 | 77 | 1:40:41 | 24:51 |
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 John's time of 1:26:02 at age 61. This is not John's personal best time, which is 1:19:33 at age 52, but it is his best age corrected time. John's six best age corrected times (all less that 2 minutes off his line) are at ages 52, 60, 61, 62, 66, and 67.