幾つ

1. Origins, structure, and basic meaning

• Structure: 幾つ is read as いくつ and is an interrogative expression meaning either how many for objects or how old for a person's age.
• Basic usage: Use りんごは幾つ to ask how many apples there are and 弟さんは幾つ to ask a younger brother's age.

2. Common pitfalls and similar expressions

• Difference between 幾つ and 何歳
  • The former can ask about either quantity or age, whereas the latter asks specifically about age.