const findTheOldest = function (array) {
  return array.reduce((prev, curr) => {
    const prevAge = getAge(prev.yearOfBirth, prev.yearOfDeath);
    const currentAge = getAge(curr.yearOfBirth, curr.yearOfDeath);
    return prevAge < currentAge ? curr : prev;
  });
};

const getAge = function (birth, death) {
  if (!death) {
    death = new Date().getFullYear();
  }
  return death - birth;
};

// Do not edit below this line
module.exports = findTheOldest;