I apologize if this is posted in the wrong forum but I have a curious question. I am age 20 (I do not turn 21 for a few months). And I am flying first class (AA) from ORD to DFW, then business on Qantas to Sydney. Would it be illegal for me to ask for a glass of wine, on the Sydney route? I am assuming on the ORD-DFW route it will be illegal (though I have been offered a glass of wine multiple times).

Thank you for your help,

Just a curious question :P