function findYoungestPerson(persons) {
    var minAge = Number.MAX_VALUE;

    for (var i = 0; i < persons.length; i++) {
        if (persons[i].age < minAge) {
            var result = persons[i];
            minAge = persons[i].age;
        }
    }
        console.log('The youngest person is %s %s', result.firstname, result.lastname);

}
var persons = [
        { firstname : 'George', lastname: 'Kolev', age: 32},
        { firstname : 'Bay', lastname: 'Ivan', age: 81},
        { firstname : 'Baba', lastname: 'Ginka', age: 40}];
findYoungestPerson(persons);