Is the word order in the quantity correct in the following sentence?
The boy is 3 years and a half old.
If not what would be the right way to say it?
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Number quantities in English should be written with the number before the thing being counted. That is,
There are [quantity][type of quantity]
For example, the following are correct:
He is [three][years old]
He is [three and a half][years old]
This also works with other quantities, like weight or mass:
I have [5 and a quarter][pounds of apples]
I have [dollars] and [cents]