JavaScript array reduce() example 2

reduce2.js

let animals = [
    {name: 'Tibbers', type: 'cat', isNeutered: true, age: 2},
    {name: 'Fluffball', type: 'rabbit', isNeutered: false, age: 1},
    {name: 'Strawhat', type: 'cat', isNeutered: true, age: 5}
  ]

// How old are all the animals combined?
// 0 is the starting value and acts as the first acculmulator value
// will return 8

let totalAge = animals.reduce((acculmulator, animal) => {
    return acculmulator + animal.age;
}, 0);

// lets say you want to find out the oldest animal 
// code below will return {name: 'Strawhat', type: 'cat', isNeutered: true, age: 5}

let oldestPet = animals.reduce((oldest, animal) => {
    return (oldest.age || 0) > animal.age ? oldest : animal;
  }, {});

  // decrypting the code above and how terniaries work 
  // the condition --> (oldest.age || 0) > animal.age 
  // if true --> ? oldest
  // else --> : animal