Well, to do this properly, we’d need to know the direction that he’s running, with or against the rotation of the Earth, and we’d also need to take into account the Earth’s gravitational field.
The plane ride to Rio had about a million times more effect (around 10 nanoseconds) than his 100-m race. His moving at a relatively slow pace (in comparison to other forms of human motion) for such a short time (some seconds) is far, far from the determining factor in his relativity-modified age.