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Discover LudwigThe phrase "at 3 years" is correct and usable in written English.
It can be used to indicate a specific age or time frame, often in contexts related to development, milestones, or age-related criteria.
Example: "The child is expected to start preschool at 3 years, as this is the typical age for enrollment."
Alternatives: "by the age of 3" or "when they are 3 years old".
Exact(60)
He composed at 3 years of age.
Assisted primary patency was 82% at 3 years.
20% of patients were alive at 3 years.
Duration of lactation and maternal adipokines at 3 years postpartum.
He remains free of symptoms at 3 years on oral anticoagulation, with a patent venous architecture.
Women are followed up to an exit examination at 3 years.
Primary and primary assisted graft patency rates at 3 years were 32%and53%3%, respectively.
With a median follow-up of 3.6 years, overall survival at 3 years was 85%.
However, at 3 years from the time of operation, patients had not reached control subject levels.
The overall patient survival rate was 93% at 1 year and 86% at 3 years.
Results: Eighteen out of 114 surviving children suffered neurologic illness at 3 years of age.
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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