PDO statement fetchall not returning required result - php

Question

I have read all other PDO topic in stackoverflow and tried all the stuff, but still its not working, i don't know whats wrong
on the Edit/Change Password page
I am using this code
ob_start();
session_start();
require_once './../account/config.php';
$id = $_SESSION['id'];
if (isset($_POST["submit"])) {
$opwd = mysql_real_escape_string($_POST['oldpwd']);
$npass = mysql_real_escape_string($_POST['newpwd']);
$anpass = mysql_real_escape_string($_POST['renewpwd']);
$sql = "SELECT COUNT(*) AS count from users where id = :id";
try {
$stmt = $DB->prepare($sql);
$stmt->bindValue(":id", $id);
$stmt->execute();
$result = $stmt->fetchAll();
here, $result[0]["password"] is not fetching the result from table users and column password
I even tried $result["password"] but not working,
in other pages same method is working very perfect but here its not fetching result
So, even user puts correct old password, its returning Current Password is Incorrect
if($result[0]["password"] !== $opwd) {
$msg = "Current Password is Incorrect";
}
elseif($npwd !== $rnpwd) {
$msg = "New Passwords did not match.";
}
elseif (($result[0]["password"] === $opwd) && $npwd === $rnpwd) {
$sql = "UPDATE `users` SET (`password`, `retype`) = (:npswd , :anpwd) WHERE `id` = :id";
$stmt = $DB->prepare($sql);
$stmt->bindValue(":npswd", $npass);
$stmt->bindValue(":anpwd", $anpass);
$stmt->bindValue(":id", $id);
$stmt->execute();
$msg = "Your Password is changed successfully";
$msgType = "success";
}
else {
$msg = "Error Occured. Please Contact us if you have some issue.";
}
}
catch (Exception $ex) {
echo $ex->getMessage();
}
}
Please guide me what am i missing here