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」は数や年齢を尋ねる疑問詞です。英語の「how many」や「how old」にあたります。「りんごはいくつ？」や「おいくつですか？」のように使われます。