Not returning right thing


#1



https://www.codecademy.com/courses/spencer-sandbox/4/4?curriculum_id=506324b3a7dffd00020bf661


Codeacademy says:
Oops, try again. Your olderAge function seems to be returning something other than a number. The function should return the AGE of the older person

The console is showing:
The older person is [object Object]


// Our person constructor
function Person (name, age) {
    this.name = name;
    this.age = age;
}

// We can make a function which takes persons as arguments
// This one computes the difference in ages between two people
var ageDifference = function(person1, person2) {
    return person1.age - person2.age;
};

// Make a new function, olderAge, to return the age of
// the older of two people
var olderAge = function(person1, person2){
    if (person1.age > person2.age) {
        return person1
    }else if (person1.age < person2.age){
        return person2.age
    }else{
        return person2.age
    };
};
// Let's bring back alice and billy to test our new function
var alice = new Person("Alice", 30);
var billy = new Person("Billy", 25);

console.log("The older person is " + olderAge(alice, billy));


#2

Return person1.age rather than the person1 object itself.