年を取ると目ざとくなる。

tbd

As one grows old, one becomes a light sleeper.

彼は金もうけのあらゆる機会に目ざとい。

tbd

He is alert to every chance of making money.

ブースカ大好きの水田さんは、偶然入った店でめざとくブースカグッズを見つけて早速買うことにした。

tbd

Ms. Mizuta likes that "Buska" character so much that last time she happened by a store that had Buska goods, she homed in on them and bought one on the spot.