| Male |
| 26 |
| 30th April 1990 |
| England |
| Jack Maitland, Ben Bright |
| 9 years 4 months |
| When his brother Alistair was selected for Great Britain age 12, 9-year-old Jonathan was inspired to do they same. This season Jonathan is currently ranked third in the ITU World Triathlon Series with two events remaining after Rio. |