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Discover LudwigThe phrase "13 years old" is correct and commonly used in written English.
It is used to describe someone's age when they are 13 years old. Example: "Samantha was only 13 years old when she won the national spelling bee competition."
Exact(50)
They were just 13 years old.
I was 13 years old.
YouTube is 13 years old.
Two were 13 years old.
He was only 13 years old.
"Otherwise, I look 13 years old".
Similar(10)
To a 13 year old.
There were no VTE events in patients <13 years old.
And 12 years old.
At 20 years old".
89 years old.
More suggestions(5)
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com