英语短语：一个11岁的男孩（三种）

boy aged 11 a boy at the age of 11 an 11-year-old boy a boy who is 11 years old

(1)an eleven-year-old boy (2)a boy at the age of 11 (3)a boy of 11

a eleven-year-old boy\a 11years old boy\a boy of 11 最后一个不确定

a boy aged 11 a boy at the age of 11 an 11-year-old boy a boy who is 11 years old

an 11-year-old boy a boy up to age 11 a boy who is 11 years old