Find out when a user was created and display varied content depending on time since creation

Yes you can!

<?php 
get_currentuserinfo(); 
$user_data = get_userdata($user_ID);
$registered_date = $user_data->user_registered;
if (strtotime($registered_date) > strtotime('-30 days')){
   //Text for users registered in the last 30 days
}
?>

hope this helps

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