- He is aged 45
- He is 45 years old
Do both expressions have the same meaning and can used interchangeably?
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These both have the same meaning and can be used interchangeably. However the second of the two is much more common.
"He is aged 45" means that the person or people you are referring to is/are of the given age. Note that this is exclusive of a person. "~ years old" can apply to a non-person object such as a building too.