5 weeks of age vs 5 weeks old

Both "5 weeks of age" and "5 weeks old" are correct and commonly used phrases in English. They can be used interchangeably to describe the age of something or someone in weeks.

Last updated: March 27, 2024 • 1335 views

This phrase is correct and commonly used in English to describe the age of something or someone in weeks.

"5 weeks of age"

This phrase is used to indicate the specific age of something or someone in weeks. It is commonly used in contexts such as describing the age of a baby or an animal.

Examples:

The puppy is only 5 weeks of age.
The baby bird is 5 weeks of age and still learning to fly.

Show examples from the web [+]

The field trials confirm the results obtained in the laboratory safety experiments and show that the product is safe for the target animal (piglets from 5 weeks of age r
In turkeys the product is used in animals of 5-6 weeks of age.
Outside the summer season a 25 % bonus is paid, and in winter 5 weeks of holidays are allowed.
The follow-up time was up to 24 weeks of age.
Only at 25 weeks of age was this decrease no longer significant.
One dose of 0.5 ml should be given at 10 to 14 weeks of age.
Cats over 8 weeks of age.
Ingelvac CircoFLEX is used to vaccinate pigs from two weeks of age against PCV2 infection.
Do not use in horses less than 6 weeks of age.
STRONGHOLD must not be used in animals under six weeks of age.
Do not use in animals under 6 weeks of age.
The first dose can be administered at 6 weeks of age.
Do not use in kittens under 9 weeks of age.
Do not use in kittens under 9 weeks of age.
Do not use in kittens under 9 weeks of age.
Social behaviour in dogs develops between four and twenty weeks of age.
Porcilis Pesti is used to immunise healthy pigs from the age of 5 weeks onwards to prevent death and or
Females with kittens under four weeks of age or in the last two weeks of pregnancy may be housed singly.
Rotarix is used in babies from six weeks of age as a vaccine to prevent gastroenteritis (diarrhoea and vomiting) caused by rotavirus infections.
RotaTeq is a vaccine given to babies from six weeks of age to prevent gastroenteritis (diarrhoea and vomiting) caused by rotavirus infections.

Alternatives:

5 weeks old
5 weeks
5 weeks in age
5 weeks in age
5 weeks in existence

This phrase is correct and commonly used in English to describe the age of something or someone in weeks.

"5 weeks old"

This phrase is used to indicate the specific age of something or someone in weeks. It is commonly used in contexts such as describing the age of a baby or an animal.

Examples:

The kitten is 5 weeks old and already very playful.
The plant is only 5 weeks old but growing rapidly.

Alternatives:

5 weeks of age
5 weeks
5 weeks in age
5 weeks in age
5 weeks in existence

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5 weeks of age vs 5 weeks old

"5 weeks of age"

"5 weeks old"

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