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もっと分別があって

having more sense or better judgment

→ もっと
phrase Rare #39,347
having more sense or better judgment 分別 here means good judgment or maturity, not sorting or separating things.
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.

君はもっと分別があってもいい年だよ。

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.