1) a ten years old boy is sitting on the couch.
2) a ten year old boy is sitting on the couch.
3) a ten-years old boy is sitting on the couch.
4) a ten-year old boy is sitting on the couch.
Which is correct?
Generally, when units of measure are used as adjectives, or as part of a compound noun, they are singular. When expressed as simple nouns, they are plural. Thus,
A ten-year-old boy is sitting on the couch.
The boy sitting on the couch is ten years old.
The boy sitting on the couch is a ten-year-...
So when I am talking about Stack Exchange chatrooms - which are frozen after 14 days of silence - the phrase "14-day limit" would be correct and "14-days limit" would be incorrect, right?
I guess it's quite natural to be cautious about asking a question on any SE site.
And in this case, I suppose there are countless duplicates - but not that easy to find for somebody who isn't sufficiently familiar with the site (and the topic).
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