LoginYear old vs. Year-old
What Is Their Main Difference?
Both Indicate the age. However, 'year old' simply describes someone's age, whereas, 'year-old' comes when it functions as an adjective.
Differences
We use 'year old' when we are mainly describing someone's age, whereas, 'year-old' comes when it functions as an adjective. Look at the examples below:
How can a 17 year-old kill half of the humanity?
Hello. I'm Sara. I'm 55 years old.
Similarities
Both point out someone's age. Check out the examples below:
You're five years old?
A 20 year-old girl like you can never beat me in anything.
Are They Interchangeable?
Since they have different grammatical functions, if we use them interchangeably, our sentence will be incorrect. Compare:
✓ It seems that a 15 year-old boy has led these protests.
X It seems that a 15 years old boy has led these protests.
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