This brings to mind two incidents which happened when Aer John was under-age.
One was when he was within 6 weeks of his 18th birthday on a VS flight from DXB in UC. On several previous flights to different destinations on the VS network in UC he had always been offered champagne with a tongue-in-cheek "don't you dare say 'yes' young man and in any case your mother is watching" attitude. He would pretend to go for the champagne and at the last minute would switch to water with a twinkle in his eye and a cheeky grin followed by the usual banter you would expect and enjoy from VS cabin crew.

On this, his last flight before his 18th birthday, he was looking forward to the one last enactment of this ritual (and indeed he could easily have got away with taking the champagne) but to his disappointment and annoyance he was only offered orange juice or water.
The second one was much earlier and on my first trip to Orlando (and indeed the USA). We were staying in a Disney resort and at the end of the first day we went to the in-hotel store to get some soft drinks and snacks and of course, something for Mum! At the check-out desk, while struggling to get out my card I handed something to Aer John to hold in order to free one of my hands. It just happened to be the "something for Mum" whereupon the lady at the desk went ballistic saying he wasn't even allowed to handle alcohol according to state law. She took it from him and put it back on the shelf and I had to go back and retrieve it again!!