The legal drinking age in Iceland is 20. This is significantly higher than most European countries, and it's to do with the historical voting age.
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16- and 17-year-oldsSomeone aged 16 or 17 and accompanied by an adult, can drink (but not buy) beer, wine or cider with a meal at a licensed premises (except in Northern Ireland). But it's illegal for people this age to drink spirits in a pub anywhere in the UK, even with a meal.
Legally, someone aged 16 or 17 can enter a pub, club or nightclub if accompanied by someone over the age of 18. But, understandably, many nightclubs want to prevent this. Some nightclubs will allow entry after midnight on the day of the customer's birthday.