Problems faced in following countries may occur who have pull down menus for selecting date of birth
canada,
Micronesia,
Palau,
Philippines,
United States

To Solve this problem, Just follow these steps.

1. open catalog/includes/functions/html_output.php in a well trusted editor (notepad will work)
2. change from line # 559 to 562, the current code will be
   // mm dd yy contries = 38 canada,139 Micronesia,163 Palau,168 Philippines,223 & 224 United States
if(STORE_COUNTRY == 223 || STORE_COUNTRY == 224 || STORE_COUNTRY == 38 || STORE_COUNTRY == 139 || STORE_COUNTRY == 163 || STORE_COUNTRY == 168) {
  $field .= tep_draw_pull_down_menu($named, $months, $month, $params);
  $field .= tep_draw_pull_down_menu($namem, $days, $day, $params); }
   And Change it to
   // mm dd yy contries = 38 canada,139 Micronesia,163 Palau,168 Philippines,223 & 224 United States if(STORE_COUNTRY == 223 || STORE_COUNTRY == 224 || STORE_COUNTRY == 38 || STORE_COUNTRY == 139 || STORE_COUNTRY == 163 || STORE_COUNTRY == 168) { $field .= tep_draw_pull_down_menu($namem, $months, $month, $params); $field .= tep_draw_pull_down_menu($named, $days, $day, $params); }  
3. Save the file. Thats all