function calculateAge($birthdate){
	$curYear = date("Y");
	$curMonth = date("m");
	$curDay = date("d");

	$userYear = substr($birthdate, 0, 4);
	$userMonth = substr($birthdate, 4, 2);
	$userDay = substr($birthdate, 6, 2);
	$age = $curYear - $userYear - 1;

	if($curMonth >= $userMonth) {
		if($curDay >= $userDay) {$age++;}
	}
	return $age;
}