半岁英语怎么说

how old are you ?

ten years old.就是十岁的意思。

举个例子：5.5-year-old 五岁半不能那样用half

six-month old

举例来说吧：一岁半：one and half years old十岁半：ten and half years old但是，外国人很少这样表达的，若表达七岁半一般为more than seven years old.或者当强调小于某个年龄时，用less than ...years old 或者当强调只不过是某个年龄时用rather than ...years old