Age (歳)
The counter 歳 is used to express age in years and includes several irregular readings, especially for young ages.
いち · ichi
一歳
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一歳 is read いっさい, not いちさい, due to a pronunciation change where ち (chi) becomes っ (small tsu) before さ (sa). This counter 歳 is commonly used for ages.
· ni
二歳
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二歳 is read にさい, with no irregular changes. The counter 歳 is used for ages.
さん · san
三歳
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三歳 is read さんさい, with no irregular changes. The counter 歳 is used for ages.
よん · yon
四歳
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四歳 is read よんさい, which is the regular reading for the counter 歳 when counting age. There is no irregular pronunciation change for this number with this category.
· go
五歳
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五歳 is read ごさい, which is the regular reading for the counter 歳 when counting age. There is no irregular pronunciation change for this number with this category.
ろく · roku
六歳
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六歳 is read ろくさい, which is the regular reading for the counter 歳 when counting age. There is no irregular pronunciation change for this number with this category.
なな · nana
七歳
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七歳 is read ななさい, not しちさい, due to an irregular counter reading for age. The counter 歳 (sai) is commonly used for age in Japanese.
はち · hachi
八歳
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八歳 is read はっさい, not はちさい, due to a pronunciation change where ち (chi) becomes っ (small tsu) before さ (sa). This is a common sound change for the counter 歳 (sai).
きゅう · kyū
九歳
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九歳 is read きゅうさい, not くさい, as the reading きゅう is standard for the number nine in this context. The counter 歳 (sai) does not trigger an irregular reading here.
じゅう ·
十歳
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十歳 is read じゅっさい, not じゅうさい, due to an irregular counter reading for age. The counter 歳 (sai) causes 十 to change from じゅう to じゅっ in this context.