PHP Age Calculator

$ageTime = mktime(0, 0, 0, 9, 9, 1919); // Get the person's birthday timestamp
$t = time(); // Store current time for consistency
$age = ($ageTime < 0) ? ( $t + ($ageTime * -1) ) : $t - $ageTime;
$year = 60 * 60 * 24 * 365;
$ageYears = $age / $year;
 
echo 'You are ' . floor($ageYears) . ' years old.';