I know of 3 of my 4 children getting drunk enough to need looking after by friends at that age. They haven't gone on to have a drink problem, and all are responsble adults in their 30s now. They only told me how drunk they had been years later. This, despite all the information-giving and dinner table conversations about controlling alcohol use.
The only incident that did cause me concern was when one of my sons went clubbing with uni friends at the age of 19. They drank some shots and a lager, and when they got outside my son felt ill. They tried to get back in the club with him, but the doorman took a look at him and refused them entry, so just one went back in to get him a soft drink. His stomach reacted and next thing he was on the pavement, so his friends asked for help. Both ambulance and police car arrived, but because he had red stains down his shirt front, they plumped for the ambulance.
An hour later, I received a phone call from the mother of one of his friends, saying can you come to A and E, he will be ok but needs you to bring him home. She had been brought to the hospital because my son kept saying 'please don't tell my mum, she'll go mad!' I arrived and was horrfied to see my blood-stained son on a bed, protesting he was ok and very, very sorry. The bloodstains were tomato juice, thank goodness. The doctor came along, clipped him round the ear and told him next time they would pump his stomach!
It gets brought up every now and again, if he pontificates about anyone else drinking too much as a teenager.