But we can give our children alcohol at home from the age of five, as it's assumed that their drinking will be supervised.
Anyway, this is pedantry, and I shall apologise and make up for it with an anecdote...
I suspect my first drink was at around the age of five or six. I don't remember the age precisely, but I do remember the drink - a brandy. My gran gave it to me to try to make me sleepy whilst I was hyperactive.
(All she got was a drunk hyperactive child. At first this was deemed a failure, but it soon became clear that a drunk hyperactive child asks the most delightfully improper questions, and the amusement this provided meant it was actually a success.)