lifeInWeeks.js

function lifeInWeeks(age) {

    var yearsRemaining = 120 - age;
    var days = yearsRemaining * 365;
    var weeks = yearsRemaining * 52;
    var months = yearsRemaining * 12;

    console.log('You have ' + days + ' days, ' + weeks + ' weeks, and ' + months + ' months left.');
}

lifeInWeeks(18);