Category or Tournament

[OmarLEFG]

what do we use here and if both are right, which one is more correct or accurate.
"My son participated in the youngest age ....
of the running race and won a medal"
(Category - Tournament)

 

[emsr2d2]

Which do we should I use here and, if both are right, which one is more correct or accurate?

"My son participated in the youngest age ___________ of the running race and won a medal."
1. category
2. tournament

Note my changes above.

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