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function ger2enDate($date)
{
   $date = explode(".", $date);
   $date = $date[2]."-".$date[1]."-".$date[0];
   return $date;
}

function getAge($birthday)
 {
   $today = getdate();
   $birthday = explode("-", $birthday);
 
   $birth_day = $birthday[2];
   $birth_month = $birthday[1];
   $birth_year = $birthday[0];
      
   $today_day = $today["mday"];
   $today_month = $today["mon"];
   $today_year = $today["year"];
   
   if (substr($birth_day, 0, 1) == "0")
     $birth_day = substr($birth_day, 1, 1);
   if (substr($birth_month, 0, 1) == "0")
     $birth_month = substr($birth_month, 1, 1);
   if (substr($birth_year, 0, 1) == "0")
     $birth_year = substr($birth_year, 1, 1);     
   if (substr($today_day, 0, 1) == "0")
     $today_day = substr($today_day, 1, 1);
   if (substr($today_month, 0, 1) == "0")
     $today_month = substr($today_month, 1, 1);
   if (substr($today_year, 0, 1) == "0")
     $today_year = substr($today_year, 1, 1);                
        
   if ($today_month > $birth_month)
     $age = $today_year - $birth_year;
   if ($today_month == $birth_month) {
     $age = $today_year - $birth_year;
     if ($today_day < $birth_day)
       $age--;
   }
   if ($today_month < $birth_month)
     $age = ($today_year - $birth_year) -1;      
     
   return $age;
}

$alter = getAge(ger2enDate($data[birth]));

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11.9.1985 

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date("D.m.Y",$date);

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CREATE TABLE `benutzer` (
  `id` int(11) NOT NULL auto_increment,
  `name` varchar(255) NOT NULL default '',
  `geburtstag` varchar(255) NOT NULL default '',
  PRIMARY KEY (`id`)
) TYPE=MyISAM;

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$db_server = "localhost";
$db_name = "selfphp";
$db_user = "root";
$db_passwort = "mega";
         
$db = @MYSQL_CONNECT($db_server,$db_user,$db_passwort) or die ("Konnte keine Verbindung zur Datenbank herstellen");
$db_check = @MYSQL_SELECT_DB($db_name);

$query = mysql_query("SELECT * FROM user LIMIT 1",$db);
$row = mysql_fetch_row($query);

$alter = getAge(ger2enDate($row[1]));

echo $alter;

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 $birth_month)
     $age = $today_year - $birth_year;
   if ($today_month == $birth_month) {
     $age = $today_year - $birth_year;
     if ($today_day < $birth_day)
       $age--;
   }
   if ($today_month < $birth_month)
     $age = ($today_year - $birth_year) -1;      
     
   return $age;
}

$db_server = "localhost";
$db_name = "selfphp";
$db_user = "root";
$db_passwort = "mega";
         
$db = @MYSQL_CONNECT($db_server,$db_user,$db_passwort) or die ("Konnte keine Verbindung zur Datenbank herstellen");
$db_check = @MYSQL_SELECT_DB($db_name);

$query = mysql_query("SELECT * FROM user LIMIT 1",$db);
$row = mysql_fetch_row($query);

$alter = getAge(ger2enDate($row[1]));

echo $alter;

mysql_close($db);

?>

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$db_server = "localhost";
$db_name = "selfphp";
$db_user = "root";
$db_passwort = "mega";