const items = [
  { name: "Sally", age: 42 },
  { name: "Bob", age: 11 },
  { name: "Sam", age: 20 },
  { name: "Eric", age: 11 },
  { name: "Michelle", age: 60 }
];

const item = items.findLast((item) => item.age === 11);

console.log(item.name); // Eric

const index = items.findLastIndex((item) => item.age === 11);

console.log(index); // 3