Minutes Left To Life Calculator

HTML

<div class='field'>
    <p>
        How old do you expect to live?
    </p>
    <input type='number' class='expected' placeholder='age'/>
</div>
<div class='field'>
    <p>
        How old are you now?
    </p>
    <input type='number' class='age' placeholder='age'/>
</div>
<p class='min-left'></p>

CSS

body {
    margin: 10px;
}

p {
    margin: 5px 0px;
}

.field {
    margin: 10px 0px;
}

JavaScript

$('.age').on('input', calculate);
$('.expected').on('input', calculate);

function calculate() {
    var age = $('.age').val();
    var health = $('.expected').val();
    
    if (!age || !health)
        return;
    
    var yearsLeft = health-age;
    
    var final = yearsLeft * 356.25 * 24 * 60;
   

    $('.min-left').text('You have about ' + final + ' minutes left');
}