Year 12 is an educational year group in schools in many countries including England, Wales, Northern Ireland, Australia and New Zealand. It is sometimes the twelfth year of compulsory education, or alternatively a year of post-compulsory education. It usually incorporates students aged between 15 and 18, depending on the locality. It is also known as "senior year" in parts of Australia. Twelfth grade – senior year in the US and parts of Canada – is Year 13 in New Zealand and Great Britain.