The counter 1歳 is used for counting: 1 year old (age - formal Kanji) (Category: 才/歳 (sai) - Age, JLPT N4). Using formal kanji 歳 (sai). One contracts with it to form 'issai' (double consonant sokuon sound change).
Context Example
娘が1歳になりました。
Musume ga issai ni narimashita.
My daughter turned one year old.
Which counter represents "1 year old (age - formal Kanji)"?
Correct! 🎉
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