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Year 12 in the UK would be either 6th Form or the first year of college, so, depending on the month you were born you would be age 16/17. Year 12 is optional as in the UK you leave school at 16 after completeing year 11.
About 17/18, but as far as I know, there is no "grade 12" in the UK, as students usually complete their GCSE's in year 11, at the age of 16.
It goes up to year 13... And about 17/18.