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  1. PO
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    <p>Move the javascript up top and make it a function so you can reference it</p> <p>Then add the onChange() to trigger the function when you change your select elements</p> <p>finally have the function output your calculation to somewhere on the page</p> <pre><code>&lt;?php $month = date("m"); //without leading zero(o) $year = date("Y"); //four digit format $day = date("d"); $st_year = "1950"; //Starting Year $month_names = array("January", "February", "March","April", "May", "June", "July", "August", "September", "October", "November", "December"); $Convertdays = $month."/".$day."/".$year; ?&gt; &lt;script type="text/javascript"&gt; function update() { var e = document.getElementById("month"); var month = e.options[e.selectedIndex].value; e = document.getElementById("day"); var day = e.options[e.selectedIndex].value; e = document.getElementById("year"); var year = e.options[e.selectedIndex].value; var birthDate = month + "/" + day + "/" + year var birth = new Date(year,month,day,0,0,0); var check = new Date(); var milliDay = 1000 * 60 * 60 * 24; // a day in milliseconds; var ageInDays = (check - birth) / milliDay; var ageInYears = Math.floor(ageInDays / 365 ); var age = parseInt(ageInDays / 365) ; if (age &lt; 3) { document.getElementById('Calculated').innerHTML = "You are under 3 years old, why are you on the computer?"; } else { document.getElementById('Calculated').innerHTML = "You are " + age; } } &lt;/script&gt; Enter your birth Date: &lt;div style="height:15px;"&gt;&lt;/div&gt; &lt;form name="Month_Year" id="Month_Year" method="post"&gt; &lt;select name="month" id="month" style="margin-right: 30px;" onChange="update();"&gt; &lt;?php for ($i=1; $i&lt;=12; $i++) { echo "&lt;option "; if ($i == $month) { echo "selected=\"selected\" "; } echo "value=\"$i\"&gt;", $month_names[$i-1], "&lt;/option&gt;\n"; } ?&gt; &lt;/select&gt; &lt;select name="day" id="day" style="margin-right: 30px;" onChange="update();"&gt; &lt;?php for ($i=1; $i&lt;=31; $i++) { echo "&lt;option "; if ($i == $day) { echo "selected=\"selected\" "; } echo "value=\"$i\"&gt;$i&lt;/option&gt;\n"; } ?&gt; &lt;/select&gt; &lt;select name="year" id="year" onChange="update();"&gt; &lt;?php for ($i=$st_year; $i&lt;=$year; $i++) { echo "&lt;option "; if ($i == $year) { echo "selected=\"selected\" "; } echo "value=\"$i\"&gt;$i&lt;/option&gt;\n"; } ?&gt; &lt;/select&gt; &lt;br&gt; &lt;/form&gt; &lt;div id="Calculated"&gt; calculated age goes here&lt;br&gt; &lt;/div&gt; </code></pre>
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    1. POAge calculator does not show computed age
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    1. POAge calculator does not show computed age
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    1. COEvery time I change the value of the combo boxes it returns 0. :(
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    2. COlooks like you have a few variable calculations out of order .. let me switch it up and re post my answer
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    3. COthe answer has been updated to pull current values from the select fields instead of using the php value within the javacsript. see if that helps.
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