First I recall was at about age 15. There were several of us and we only had about 3 cans of beer so we passed them around. But according to my dad I got drunk at a picnic when I was 3 or 4. There were glasses of draft beer with an inch or so in the bottom of them sitting on the picnic tables unattended while the adults were off playing & watching a softball game. I was going around draining what was left in each one. Dad came back to the tables and caught me in the act and said by that time I was staggering.