| Mark Marzen's efforts: | From | Age | Date | Finish Time |
|---|---|---|---|---|
| Never Summer 100k (2018) | Colorado, US | 31 | Saturday, July 28, 2018 | 11:47:46.00 |
| Blue Sky Trail Marathon (2017) | CO | 31 | Saturday, October 21, 2017 | 03:37:42.00 |
| Mark Marzen's efforts: | From | Age | Date | Finish Time |
|---|---|---|---|---|
| Never Summer 100k (2018) | Colorado, US | 31 | Saturday, July 28, 2018 | 11:47:46.00 |
| Blue Sky Trail Marathon (2017) | CO | 31 | Saturday, October 21, 2017 | 03:37:42.00 |