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15 day old vs 15 days old

Both "15 day old" and "15 days old" can be correct depending on the context. "15 day old" is used when referring to the age of something in a specific unit of time, while "15 days old" is used when describing the age of something in a more general way.

Last updated: March 15, 2024 • 972 views

15 day old

This phrase is correct when referring to the age of something in a specific unit of time.

This phrase is used when specifying the age of something in days, such as a 15-day-old baby or a 15-day-old loaf of bread.

Examples:

The 15 day old baby slept peacefully.
The 15 day old bread was starting to go stale.
The 15 day old puppy was full of energy.

Show examples from the web [+]

Feb 12, 2015 ... Mom's angry Facebook post lashing out at anti-vaxxers as her 15-DAY-OLD son's life hangs in the balance from measles is shared by ...
Feb 16, 2015 ... Jennifer Hibben-White wrote a diatribe against vaccine-hesitant parents last week after a hospital said her 15-day-old son had been exposed to ...
My 15-Day-Old Son May Have Measles. Posted: 02/11/2015 10:53 am EST Updated: 02/15/2015 12:59 am EST ...
Feb 16, 2015 ... Jennifer Hibben-White was informed that she and her 15-day-old son Griffin may have been exposed to measles in her doctor's waiting room, ...

Alternatives:

15-day-old
15-day-old baby
15-day-old loaf of bread

15 days old

This phrase is correct when describing the age of something in a more general way.

This phrase is used when talking about the age of something without specifying the unit of time, such as a 15 days old baby or a 15 days old loaf of bread.

Examples:

The baby is 15 days old today.
The bread on the shelf is 15 days old.
The puppy is 15 days old and already learning tricks.

Show examples from the web [+]

Nov 23, 2014 ... He found that a third of the fish – including some from Morrisons, Asda and Sainsbury's – was between 12 and 15 days old.
Jun 8, 2011 ... This feature is not available right now. Please try again later. Uploaded on Jun 8, 2011. Baby Noah getting his first bath at 15 days old ...
Jan 29, 2013 ... 15 days old,and to two and a half weeks! Read moreShow less. Show more Loading... Loading... Advertisement. Autoplay When autoplay is ...
Nov 22, 2014 ... In worrying findings, a third of the samples were between 12 and 15 days old – a score of six. That is the absolute minimum standard of ...

Alternatives:

15-day-old
15-day-old baby
15-day-old loaf of bread

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