

function age($birthday){
	$now = time();
	$dt=$now-$birthday;
	//let us check if current the date is far enought from birthday
	//(>2days), we   can use simlified way to calculate age
	if( !((($dt+172800)%31557600)<345600) ){
		$age=floor( $dt/31557600 );
	}else{
		$datestamp = date("d-m-Y", $now);
		list($current_day, $current_month,$current_year)= explode("-" , $datestamp);
		list($birth_year, $birth_month, $birth_day) = explode("-" , date('Y-m-d',$birthday));

		$age = $current_year - $birth_year;

		if(	($birth_month > $current_month) || 
			($birth_month == $current_month && $current_day < $birth_day) ) $age--;
	}
	return $age;
}