在php中回声表单输入

I've written these 2 simple php code, to test php with jQuery:

FILE aaa.php

<!DOCTYPE html>
<html>
<head>
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <link rel="stylesheet" href="https://code.jquery.com/mobile/1.4.5/jquery.mobile-1.4.5.min.css">
  <script src="https://code.jquery.com/jquery-1.11.3.min.js"></script>
  <script src="https://code.jquery.com/mobile/1.4.5/jquery.mobile-1.4.5.min.js"></script>
</head>
<body>
  <form action="bbb.php" method="POST">
    <p>Il tuo Nome: <input type="text" name="name" value="" /></p>
    <p>La tua et: <input type="text" name="age" value ="" /></p>
    <p><input type="submit"></p>
  </form>
</body>
</html>

FILE bbb.php

Ciao <?php echo htmlspecialchars($_POST['name']); ?>.
La tua eta e di <?php echo (int)$_POST['age']; ?> anni.

But it doesn't work, because I don't receive any variable on bbb.php.

Could someone explain why?

if you are using jquery mobile without ajax form submission, you need to data-ajax="false" in form.

<form action="post.php" method="POST" data-ajax="false">