a week old

USAGE SUMMARY

The phrase "a week old" is correct and usable in written English.
It can be used to describe something that has existed or been in a particular state for one week. Example: "The bread is a week old and should be thrown away."

✓ Grammatically correct

News & Media

Science

Wiki

Human-verified examples from authoritative sources

Exact Expressions

42 human-written examples

Some were only a week old.

The New York Times - Travel

Age: A week old, and counting.

The Guardian - Music

The broadcast was more than a week old.

The New Yorker

He thought she could be about a week old.

The New Yorker

Today I have a boy / A week old.

The New York Times - Books

They pointed out that the war was only a little more than a week old.

The New Yorker

Human-verified similar examples from authoritative sources

Similar Expressions

15 human-written examples

It tastes like a week-old salad.

The New York Times - Books

He read a message about a week-old baby.

The New Yorker

Benny Greenspan makes a personal remark after reading a week-old gossip column.

The New Yorker

They first methodically demolished a week-old protective wall as Egyptian security forces stood by.

The New York Times

(Sadly, the latest of Washington's popular pandas, a week-old baby, died Sunday).

The New York Times

Expert writing Tips

Best practice

Use "a week old" when the weekly measure provides sufficient and easily understood context, as in describing the age of a puppy or a news story.

Common error

Avoid using "a week old" in contexts requiring extreme precision, such as in medical reports or scientific studies where the exact number of days or hours is crucial. Instead, opt for more specific measurements.

Linguistic Context

The phrase "a week old" functions as an adjectival phrase, modifying a noun to indicate its age. As Ludwig AI suggests, it is grammatically correct and usable in various contexts, as demonstrated by numerous examples.

Expression frequency: Very common

Frequent in

News & Media

48%

Wiki

20%

Science

18%

Less common in

Formal & Business

5%

Reference

5%

Encyclopedias

4%

Ludwig's WRAP-UP

In summary, "a week old" is a grammatically sound and frequently used adjectival phrase that specifies the age of something as one week. As Ludwig AI confirms, its neutral register makes it suitable for diverse contexts, from news reports to casual conversation. While precision may sometimes necessitate alternatives like "seven days old", "a week old" provides a clear and concise way to express duration. Common contexts include News & Media, Wiki and Science.

More alternative expressions

Phrases that express similar concepts, ordered by semantic similarity:

seven days old

Specifies the age in days instead of weeks.

seven-day-old

Uses a hyphenated adjective form to describe the age.

one week in age

Rephrases the age using "in age" for a slightly more formal tone.

just a week

Shortened version, emphasizing the brief duration.

newly born seven days ago

Focuses on the recent birth, specifying the time passed.

one week of existence

Focuses on the duration of something's life or being.

a week since its creation

Emphasizes the creation or beginning point and the week that has followed.

in its first week

Highlights that something is within its initial week.

dating back one week

Highlights the starting point of something from a week prior.

a single week of age

Adds emphasis on the brevity of the time.

FAQs

How can I use "a week old" in a sentence?

You can use "a week old" to describe the age of something, such as "The puppy is "a week old"" or "The news story is "a week old"".

What are some alternatives to saying "a week old"?

Alternatives include "seven days old", "one week in age", or "newly born seven days ago", depending on the context.

Is it better to say "a week old" or "one week old"?

Both "a week old" and "one week old" are grammatically correct and commonly used. The choice often depends on personal preference or the specific style guide being followed.

When should I use "seven days old" instead of "a week old"?

Use "seven days old" when precision is important, or in formal or scientific contexts. ""a week old"" is generally fine for informal communication.