When I was growing up in the 70s, it was totally normal for a dad to give their under 10 year old kid some money and send them to the corner store to buy a pack of cigarettes for dad.
Japan namely. While I cannot say whether or not a store would sell beer to a 5 year old, no longer can anyone just buy beer or cigarettes (and more) from vending machines.
I gather things are different now over there...