Age calculation with PHP

[Benson]

I found this little bit of PHP code that will display a person's age in a web page. How can I change it so that the result will be "12" instead of "12.02345"?

<?php 
    $dofb = strtotime ("2 November 1980"); // date to calculate from
    $age = strtotime ("now")-$dofb;
    $age_in_years = $age/31557600; // 31557600 seconds in a year
    echo "$age_in_years"; 
?>

[Benson]

I found it (yea!)

<?php 
    $dofb = strtotime ("2 November 1980"); // date to calculate from
    $age = strtotime ("now")-$dofb;
    $age_in_years = $age/31557600; // 31557600 seconds in a year
    $current_age = floor($age_in_years);
    echo "$current_age";
	
?>