40 year old

USAGE SUMMARY

The phrase "40 year old" is correct and usable in written English.
It can be used to describe a person’s age or to refer to something that is 40 years old. Example: "She is a 40 year old woman who has accomplished many things in her career."

✓ Grammatically correct

News & Media

Science

Human-verified examples from authoritative sources

Exact Expressions

5 human-written examples

Remember the protagonist's house in The 40 Year Old Virgin?

TechCrunch

Remember this guy from The 40 Year Old Virgin?

TechCrunch

The NBA has 40 year old guards -- like Jason Kidd.

Huffington Post

Watch The 40 Year Old Virgin, from 2005.

Huffington Post

(40 year old TBA).

BMC Pregnancy and Childbirth

Human-verified similar examples from authoritative sources

Similar Expressions

55 human-written examples

Why has a 40 year-old book proved so enduring?

The New York Times - Arts

"Yes, you drill the 40 year-old much more.

BMC Family Practice

"Fukushima, you must understand, was a 40-year old reactor.

BBC

(40-year old female, post-WC).

Globalization and Health

It was a 40-year-old bottle.

The New York Times

"The 40-Year-Old Virgin" was divine.

The New Yorker

Expert writing Tips

Best practice

When using "40 year old" as an adjective before a noun, consider hyphenating it as "40-year-old" for better readability. For example, "a 40-year-old man".

Common error

Avoid using "40 year-old" with a hyphen when it's not acting as a compound adjective. For instance, it's correct to say "He is 40 years old" without the hyphen.

Linguistic Context

The phrase "40 year old" functions primarily as an adjective phrase followed by a noun, modifying the noun to indicate age. As Ludwig AI confirms, it's a standard and usable expression.

Expression frequency: Common

Frequent in

News & Media

48%

Science

38%

Wiki

7%

Less common in

Formal & Business

4%

Reference

2%

Encyclopedias

1%

Ludwig's WRAP-UP

In summary, "40 year old" is a grammatically correct and commonly used phrase for indicating age. As highlighted by Ludwig AI, it’s suitable for diverse contexts, although hyphenation as "40-year-old" is recommended when used as a compound adjective. While it appears most frequently in news and media, it’s applicable across various domains like science and general conversation. Be mindful of hyphen usage to avoid common errors, and consider related phrases like "aged 40 years" for stylistic variation.

More alternative expressions

Phrases that express similar concepts, ordered by semantic similarity:

40-year-old

Uses a hyphen for a more concise adjectival form.

forty-year-old

Spells out "forty" and uses a hyphen for adjectival form.

aged 40 years

Rephrases using "aged" and specifies "years" for clarity.

a 40-year-old individual

Replaces "old" with "individual" for a more formal tone.

a person of 40 years

Emphasizes "person" and uses "of" to connect the age.

someone who is 40 years old

Expresses the age as a characteristic of "someone".

an individual of forty years

Similar to 'a person of 40 years', but uses the term 'individual' instead.

a person that is 4 decades old

Expresses the age using decades.

in their 40th year

Focuses on being "in" a specific year of life.

an adult of 40 years

Replaces the general 'old' with 'adult' to emphasize maturity.

FAQs

How can I use "40 year old" in a sentence?

You can use "40 year old" to describe someone's age, as in "She is a "40 year old" woman". Alternatively, you can say "She is 40 years old".

What's a more concise way to write "40 year old"?

A more concise way to write "40 year old", especially when using it as an adjective, is to use "40-year-old". For example, "a 40-year-old building".

Is it grammatically correct to say "40-years-old"?

No, it is not grammatically correct to say "40-years-old". The correct forms are "40 year old" or "40 years old" as a noun, and "40-year-old" as an adjective.

What's the difference between "40 year old" and "40 years old"?

"40 year old" is typically used attributively (before a noun), while "40 years old" is used predicatively (after a verb). For example, "a 40 year old system" versus "the system is 40 years old".