six months old

USAGE SUMMARY

The phrase "six months old" is correct and usable in written English.
You can use it to indicate the age of something. For example: "The baby is now six months old."

✓ Grammatically correct

News & Media

Science

Formal & Business

Human-verified examples from authoritative sources

Exact Expressions

55 human-written examples

Six months old.

The New York Times

Men's were on average six months old.

The New York Times

Pumpkin (female, tortoiseshell, six months old): Hi there!

The New Yorker

Sally's colic persisted until she was nearly six months old.

The New Yorker

Mr Fox's term is less than six months old.

The Economist

The politics of the child, six months old, are unclear.

The New York Times

Human-verified similar examples from authoritative sources

Similar Expressions

5 human-written examples

Nearly three months old.

The New Yorker

"They're three months old".

The New Yorker

Huck is eight months old.

The New York Times

Four months old".

The New York Times

She said: "This is three months old.

Independent

Expert writing Tips

Best practice

When using "six months old" to describe a noun, ensure the context clearly indicates whether you are referring to age (of a person, animal, object) or duration (of a project, term, etc.).

Common error

Avoid using hyphens incorrectly. "Six-months old" is incorrect. It should be "six months old" unless it's acting as a compound adjective before a noun, in which case it becomes "six-month-old baby".

Linguistic Context

The phrase "six months old" typically functions as an adjectival phrase modifying a noun, indicating the age of someone or something. Ludwig provides numerous examples where it describes babies, animals, or even projects, as confirmed by Ludwig AI.

Expression frequency: Very common

Frequent in

News & Media

50%

Science

25%

Formal & Business

10%

Less common in

Academia

5%

Wiki

5%

Reference

5%

Ludwig's WRAP-UP

The phrase "six months old" is a common adjectival phrase used to denote age or duration, predominantly found in news, science, and formal business contexts. As Ludwig AI confirms, it's grammatically correct and widely applicable. While generally neutral, it's crucial to differentiate its use from the compound adjective "six-month-old". Remember to use hyphens only when the phrase precedes the noun it modifies (e.g., "six-month-old baby"). Leveraging Ludwig's examples will ensure accurate and effective usage.

More alternative expressions

Phrases that express similar concepts, ordered by semantic similarity:

half a year old

Replaces "six months" with its equivalent "half a year".

6-month-old

Uses a hyphenated form as a compound adjective.

of six months' duration

Focuses on the length of time, rather than age.

aged six months

Inverts the structure and uses 'aged'.

six-month mark

Indicates a milestone at six months.

at the age of six months

Adds formality and clarifies the age.

half-year-old

Combines "half year" into a single adjective.

lasting six months

Emphasizes the period of existence or validity.

being six months of age

A more formal and verbose phrasing.

in its sixth month

Focuses on the stage within a six-month period.

FAQs

How do I use "six months old" in a sentence?

You can use "six months old" to describe the age of a person, animal, or object. For example, "The baby is "six months old"" or "The project is "six months old"".

What are some alternatives to saying "six months old"?

Depending on the context, you can use alternatives like "half a year old" or "6-month-old" (when used as a compound adjective).

Is it correct to say "six-months-old"?

No, "six-months-old" is generally incorrect. The correct form is "six months old". However, when used as a compound adjective before a noun, it becomes "six-month-old", as in "a "six-month-old baby"".

What is the difference between "six months old" and "six-month-old"?

"Six months old" describes the age directly. "Six-month-old" is a compound adjective describing a noun. For example, "The baby is "six months old"", but "She has a "six-month-old daughter"".