First of all go to your Profile page in CP
then search
$_AGE$
and replace it with this:
Code
<span id="age"><b>$_AGE$</b></span>
The go to Forum ---> appeareance of entries --->
paste this at the top
Code
<script type="text/javascript">
$(document).ready(function(){
$('span.age$ID$').load('/index/8-$UID$ #age');
});
</script>
And this where u wan't the user his/her age to show
Code
User age: <span class="age$ID$">loading...</span>