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$un=$_POST['UserName'];
$ua=$_POST['UserAge'];
if($ua!=="")
{ 
update("action");
}
///////////////////////////////////////
function update($x)
{
if($x=="action")
 {
 $con=mysql_connect('localhost','root','admin');
 mysql_select_db("hx_db",$con);
 $sql="update hx_user set UserAge =".$ua."where UserName =".$un;
 mysql_query($sql);
 mysql_close($con);
 }
}

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 $sql="update hx_user set UserAge =".$ua."where UserName =".$un;
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 $sql="update hx_user set UserAge = $ua where UserName = $un";
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$sql="update hx_user set UserAge = ¡®$ua¡¯ where UserName = ¡®$un¡¯";

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PHP code:

$un=$_POST['UserName'];
$ua=$_POST['UserAge'];
if($ua!=="")
{
update("action",$un,$ua);
}
/////////////////////////////////