Unable to get the echo value in php

Hi Team,

While i am running below code, the below echo value is not displaying . Could you please check and help me regarding this.

–> echo $_Get[“username”];

--------------------Code snippet

<form action="site.php" method="get">

  Name : <input type="text" name="username">
  Age : <input type="number" name="age">
  <input type="submit">

Your name is <?php echo $_Get["username"]; ?>
and age is <?php echo $_Get[“age”];