What does ～歳 mean?
～歳 is a Japanese counter meaning “years old, age counter” in English. It is written as ～歳 in kanji, ～さい in hiragana, and ～sai in romaji. This word is part of JLPT N5 vocabulary.
Example sentences
いもうとは五歳です。
My little sister is five years old.
この犬は三歳です。
This dog is three years old.