应该表达为 when I was ten years old 或者 at the age of ten
For example:I started to study English when i was ten years old.
I started to study English at the age of ten.
应该表达为 when I was ten years old 或者 at the age of ten
For example:I started to study English when i was ten years old.
I started to study English at the age of ten.