객체 state 부분 업데이트 오류

function UserForm() {
  const [user, setUser] = useState({ name: '', age: 0 });

  const handleNameChange = (e) => {
    setUser({ name: e.target.value });
  };

  const handleAgeChange = (e) => {
    setUser({ age: Number(e.target.value) });
  };

  return (
    <form>
      <input value={user.name} onChange={handleNameChange} />
      <input value={user.age} onChange={handleAgeChange} type="number" />
    </form>
  );
}