Rugles - 9:08 pm on Jun 16, 2011 (gmt 0)
I would say 14 to 16 and make sure it is light beer. Maybe follow it up with stories of wicked hangovers etc. just to drill it into him that abuse of alcohol is painful.
I let my young kid (12) have a tiny, tiny bit of wine with dinner during special occasions. Trying to teach moderation and appreciation of the science that goes into wine making. The different regions and types of grapes etc.
Not sure if what I am doing is legal. But there is no way it is intoxicating because the amount is so small, less than an ounce.