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もっと分別があって

with more sense; showing better judgment

→ もっと
phrase Rare #42,289
with more sense; showing better judgment Used to say that someone should show better judgment, maturity, or common sense. Often appears in patterns such as もっと分別があるべきだ (should have more sense) and もっと分別があってもいい (should be mature enough to).
JA: 君はもっと分別があってもいい年だよ。
EN: You're old enough to know better.

彼はもっと分別があってもよい年だ。

He's old enough to know better.

君はもっと分別があってもいい年だよ。

You're old enough to know better.