+0
What's the difference between year old and years old?

Should I say: I'm X year old or I'm X years old?

Maybe are both correct?

Looking forward to your response.

Regards
Comments  
Still expecting to an answer...

Regards
one year old

two years old

...

twenty years old

...

fifty years old

...

CJ
Site Hint: Check out our list of pronunciation videos.
Thank you, CJ.

I see many people write I'm twenty-year-old (not years old, although it is plural). That's why I asked my question.

Could you explain this please?

Regards
Did you understand my question, CJ?
As a modifier, use the singular.

A four-year-old boy.

A 20-year-old whiskey.

To simply say "I'm 20 years old" then use the plural (except for 1).

She's 20. She's 20 years old. She's a 20-year-old woman.

He's one. He's one year old.

When referring to children, we do sometimes say " I have a four-year-old and a nine-year-old." In those cases, they are the nouns and are preceded by an article. I find it rare to use this with adults.
Students: Are you brave enough to let our tutors analyse your pronunciation?
You don't use plural forms when the number is part of a compound noun or adjective.

Compare:

A centenarian is a 100-year-old person. (this sounds a bit odd, but should be alright grammatically, and is only for demonstration purposes :-)

A centenarian is a person who is 100 years old.

As a noun:

The thirteen-year-old who lives on the other side of the road keeps staring at me.
Thanks Grammar Geek and Noctivagus. I got the idea!Emotion: smile