Yea, so? I had sips of wine and champaign at family gatherings and holidays starting about that age. Small amount, just to toast with. 4 years later in Paris, we went out to a fancy dinner boat cruise down the Seine, and I had a glass of something with every course.
Slept till noon the next day, and learned what a hangover was. To this day, Wine still gives me a foggy haze the next day. Anyway, It kind of took the mystique out of alcohol for me.
Under controlled conditions with parental consent and supervision; small amounts, I don’t see a problem with.
Beer/wine is one thing, liquor quite another... PARTICULARLY for a child.