| Leif Johnson's efforts: | From | Age | Date | Finish Time |
|---|---|---|---|---|
| Staunton Rocks! Marathon & Half 2022 (Half Marathon) | Colorado, US | 42 | Saturday, August 27, 2022 | 02:09:03.00 |
| Staunton Rocks! Marathon & Half (Half Marathon) | Colorado, US | 41 | Saturday, August 28, 2021 | 01:55:06.00 |