〜歳 (さい) is the counter for age. It is used to say how old someone is. The age 20 has a special reading: はたち. Key points: • Use number + 歳 to state age • 20 years old = はたち (special) • Question: 何歳ですか (How old?) • Polite: おいくつですか (more polite) Example: “私は二十歳です” means “I am 20 years old.” “何歳ですか” means “How old are you?” The reading さい is regular for most numbers. Remember the special form はたち for 20. Practice by stating ages: 十八歳, 二十二歳, 三十歳.