importance: 4

---

# Get average age

Write the function `getAverageAge(users)` that gets an array of objects with property `age` and gets the average.

The formula for the average is `(age1 + age2 + ... + ageN) / N`.

For instance:

```js no-beautify
let john = { name: "John", age: 25 }
let pete = { name: "Pete", age: 30 }
let mary = { name: "Mary", age: 29 }

let arr = [ john, pete, mary ];

alert( getAverageAge(arr) ); // (25+30+29)/3 = 28
```