Question

Why only name is changing the color but age is not changing ?

<div id="user">
<?php echo $user_name; ?>
<span class="age"><?php echo $user_age; ?></span>
</div>

user name color chang is working but age inside span is not working.

$(document).ready(function(){
$('#user').css('color','red');
$('#user#age').css('color','gray');  
});

Answer 1

try this

$('#user .age').css('color','gray'); 

you have a class ‘age’ which the selector should start with ‘.’ and it is inside #user, so you need the space between #user and .age .