The counter 5才 is used for counting: 5 years old (age) (Category: 才/歳 (sai) - Age, JLPT N5). 五 (go) + 才 (sai) is regular. No sound changes are triggered.
Context Example
息子は5才です。
Musuko wa gosai desu.
My son is five years old.
Which counter represents "5 years old (age)"?
Correct! 🎉
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