American Masters 50 mi. Outdoor Track & Field Records
| pending | |
| women-only |
Men
| Division | Performance | Name | Location | Date |
| 40-44 | 5:42:03 | Peter Jeffers (40) | Hannibal, NY | 1979-Jul-07 |
| 45-49 | 5:34:24 | Bernd Heinrich (45) | Brunswick, ME | 1985-Aug-24 |
| 50-54 | 6:09:43 | Steve Stowers (50) | Sydney, AUS | 2016-Jun-18 |
| 55-59 | 6:55:02 | Fred Nagelschmidt (55) | Santa Monica, CA | 1979-Oct-28 |
| 60-64 | 6:17:24 | Mark Richtman (61) | Riverbank, CA | 2017-Feb-25 |
| 65-69 | 7:20:01 | Ray Piva (65) | Hayward, CA | 1991-Aug-03 |
| 70-74 | 8:36:02 | George Billingsley (71) | Seattle, WA | 1993-Jun-12 |
| 70-74 | 8:23:24 | Gene Dykes (70) | Sharon Hill, PA | 2018-May-12 |
| 75-79 | 11:55:17 (p) | Lynnard Phipps (75) | Auburn, CA | 2019-Jan-12 |
| 80-84 | 13:28:41 (p) | Manuel Lovorde (84) | Auburn, CA | 2019-Jan-12 |
Women
| Division | Performance | Name | Location | Date |
| 40-44 | 6:25:16 | Ann Trason (40) | Queen Creek, AZ | 2000-Dec-31 |
| 45-49 | 7:39:14 | Suzanna Bon (47) | Phoenix, AZ | 2011-Dec-18 |
| 45-49 | 7:21:28 (p) | Suzi Swinehart (46) | Phoenix, AZ | 2018-Dec-09 |
| 50-54 | 7:08:28 | Sandra Kiddy (54) | Hayward, CA | 1991-Aug-03 |
| 55-59 | 7:59:58 | Sue Ellen Trapp (56) | Dallas, TX | 2002-Nov-29 |
| 55-59 | 7:48:04 (p) | Connie Gardner (55) | Phoenix, AZ | 2018-Dec-09 |
| 60-64 | 9:46:37 | Dixie Madsen (60) | Orange, CA | 1997-Aug-02 |
| 65-69 | 9:39:33 | Helen Klein (68) | Santa Rosa, CA | 1991-Mar-24 |
| 65-69 | 9:28:00 (p) | Maria Shields (68) | Sharon Hill, PA | 2019-May-12 |