各位老师好，下面这个句子里：Their pupils lead the rankings in the OECD’s Programme for International Student Assessment (PISA), a triennial test of 15-year-olds around the world, and the Trends in International Mathematics and Science Study, which measures ten- and 14-year-olds.


ten- and 14-year-olds.是"10-14岁的孩子"还是"10和14岁的孩子"？谢谢老师。