+1
Hi there, why do some people put "21 years old or 21-year-old?" Can you tell me why and how to use it? Thank you

I am 21 years old.

I am 21-year-old.

He is 26 years old
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Comments  (Page 2) 
You may NOT say "I am 25 years' old guy". That makes no sense. The apostrophe from sentences such as "I have 13 years' experience" is there denoting possession; the experience belongs to the 13 years. What does the apostrophe mean in "I am 25 years' old guy"? Nothing. It is incorrect in that context. An apostrophe should never be used to denote plurality. That is becoming a common misuse. In this situation, the only way to go would be to say "I am A 25-year-old guy". You can obviously also say "I am 25 years old", in which case you would not need hyphens.
I am 21years old
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I am 21 years old.

I am 21 year old.

which one is correct?
I am 21 years old.
I am a 21-year-old.
Use the missing 'of' test:
Correct
I have 25 years' experience. - I have 25 years of experience.

Incorrect
He is 35 years' old. - He is 35 years of old.
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I am 21 years old
Anonymous Hi there, why do some people put "21 years old or 21-year-old?" Can you tell me why and how to use it? Thank youI am 21 years old.I am 21-year-old.He is 26 years old
I am above 25 year old
Anonymous I am above 25 year old
I am more than 25 years old.
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I am 21 years old
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