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).

Idiom

not legally old enough to do a particular thing

Heard in 10 movies

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

Definitions from the Oxford Advanced Learner's Dictionary, 9th edition

You, out! You're under-age.

Said in 8 films · #1