Looking on the internet deeply has found these results:

5 weeks old is the most popular phrase on the web.

5 weeks of age 1560,000 results on the web	5 weeks old 1596,000 results on the web More popular!
Some examples and use cases from the internet:	Some examples and use cases from the internet:
Only at 25 weeks of age was this decrease no longer significant. up time was up to 24 weeks of age. One dose of 0.5 ml should be given at 10 to 14 weeks of age. 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 Outside the summer season a 25 % bonus is paid, and in winter 5 weeks of holidays are allowed. 6 weeks of age. In turkeys the product is used in animals of 5 The follow	It doesn't look like this phrase is very popular! The search could not find any examples on the internet.

5 weeks of age

1560,000 results on the web

5 weeks old

1596,000 results on the web

More popular!

Only at 25 weeks of age was this decrease no longer significant.
up time was up to 24 weeks of age.
One dose of 0.5 ml should be given at 10 to 14 weeks of age.
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
Outside the summer season a 25 % bonus is paid, and in winter 5 weeks of holidays are allowed.
6 weeks of age.
In turkeys the product is used in animals of 5
The follow

It doesn't look like this phrase is very popular! The search could not find any examples on the internet.