Simple function using PHP DateTime object to calculate an exact age from a DOB.

calculate_age.php

<?php

function calculateAge($dob,$in_format="d/m/Y",$out_format="%y years, %m months,$
{
        $dob = DateTime::createFromFormat($in_format, $dob);
        $int = $dob->diff(new DateTime());
        return $int->format($out_format);
}

test.php

<?php

require "calculate_age.php";

echo calculateAge("08/06/1995");

// 15 years, 1 months, 19 days