This is the 7619th most frequent Japanese word.
割に
"割に" means "relatively" or "comparatively."
In this sentence, '割に' is used to compare expectations based on age, indicating that the person's athletic abilities exceed typical expectations for someone of his age.
彼は年齢の割に運動神経が良い。
He has good athletic abilities for his age.
Here, '割に' is used to highlight that the effort invested does not correspond to the compensation received, establishing a relational comparison.
このプロジェクトは、労力の割に報酬が少ない。
The compensation is low relative to the effort for this project.
'割に' expresses a comparison with expectations, here showing a positive deviation from one's anticipated result.