Must you be 21 to take alcohol on a plane in your luggage?

Question

Must you be 21 to take alcohol on a plane in your luggage?

Answer 1

In the United States, yes.

Answer 2

Not sure where you're writing from, and assume you mean carryon but if you're in the US - yes, and if carry-on, it has to be 3 oz or less and fit into a quart size plastic bag.