don´t recognize variable of php

by

It’s not recognized because you don’t create it. Variables don’t magically appear in PHP1. You need to get that value from the $_POST superglobal: 

<HTML>
<BODY>
<?PHP
   $age = $_POST['age'];
   print ("The age is: $age");
?>
</BODY>
</HTML>

1 Anymore. They used to when register_globals existed. But that has been obsolete since long before you started coding.

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