Map array and if null value, don't insert it into the returned array

Let's assume that we are working with the following object:

javascript
let people = {
    Andrea:  {age: 27},
    Erik:    {age: 30},
    Jaruwan: {age: 26},
    Paula:   {age: 15}
}

We want to get an array with the people whose age is > 18:

javascript
let adults = Object.values(people).map(name => name.age > 18 ? name.age : null);

console.log(adults);
// [27, 30, 26, null]

If the value is null, we don't want to insert it into the array:

javascript
let adults = Object.values(people).map(name => name.age > 18 ? name.age : null);

let filtered = adults.filter(age => age !== null);

console.log(filtered);
// [27, 30, 26]

In one line of code:

javascript
let filtered = Object.values(people).map(name => name.age > 18 ? name.age : null).filter(age => age !== null);

console.log(filtered);
// [27, 30, 26]