back when i left school (2010) i was 16, there was no requirement to stay in further education in UK, so wouldn't be surprised if it was similar elsewhere. i believe it has changed in UK since then though.
This is correct; one must be in full time education up to the age of 18 now. However, this does not need to be at school; apprenticeships, correspondence courses and other kind of educational programmes count too. School leaving age (for those who are not educated at home) is still 16.