Might be a thing of social circles. For middle working class in NSW, personally, I've found it's not the norm in my circles and I might say it's also not the norm for even wealthier people- but I don't rub shoulders with these crowds a lot. I'm sure it happens though.
My experience elsewhere was that underage drinking was actually the norm across any backgrounds.
That might be more to do with your social circles. There was a shit ton of teenage drinking happening when I was in high-school.
Might be a thing of social circles. For middle working class in NSW, personally, I've found it's not the norm in my circles and I might say it's also not the norm for even wealthier people- but I don't rub shoulders with these crowds a lot. I'm sure it happens though.
My experience elsewhere was that underage drinking was actually the norm across any backgrounds.