TypeScriptでmapメソッドにオブジェクト型の値をコールバック関数に渡す方法

以下のように書く

type User = {
  id: number;
  name: string;
  age: number;
};

const users: User[] = [
  { id: 1, name: "Alice", age: 25 },
  { id: 2, name: "Bob", age: 30 },
  { id: 3, name: "Charlie", age: 35 }
];

const getUserName = (u: User): string => {
  return u.name
}

const getUserAge = (u: User): number => {
  return u.age
}
console.log(users.map(getUserName));
console.log(users.map(getUserAge));

初歩的だけど、引数()の後に:を付けて戻り値を宣言する
https://typescriptbook.jp/reference/functions/function-type-declaration