How is “under age” used?

In Beautiful Thing (1996), one line is: “You, out! You're under-age.”

Which movie is “under age” from?

The clip at the top of this page is from Beautiful Thing (1996).

You, out! You're under-age.

4 作品で登場 · 1 本目

イディオム

not legally old enough to do a particular thing

4 本の映画に登場

not legally old enough to do a particular thing
It is illegal to sell cigarettes to children who are under age.

定義：Oxford Advanced Learner's Dictionary 第 9 版