いくつ (ikutsu) is an interrogative adverb used to ask about the quantity of countable items or someone's age. It means 'how many,' 'how old,' or 'what number' in English. It's essential for counting objects like 'How many apples?' (りんごはいくつ？) or asking someone's age 'How old are you?' (おいくつですか？).

「いくつ(いくつ)」は数(かず)や年齢(ねんれい)を尋(たず)ねる疑問詞(ぎもんし)です。英語(えいご)の「how many」や「how old」にあたります。「りんごはいくつ(いくつ)？」や「おいくつ(おいくつ)ですか？」のように使(つか)われます。