JSFiddle - React, Tailwind, and code Playground

HTML

<script src="http://malsup.github.com/jquery.form.js"></script>
<div id="post_output_1">
    <form id="form_1" action="inc/action.php" method="post">
        <input id="age" type="text" name="age" />
        <input id="submit" type="submit" name="submit" />
    </form>
</div>
<div id="post_output_2">
    <form id="form_2" action="inc/action.php" method="post">
        <input id="age" type="text" name="age" />
        <input id="submit" type="submit" name="submit" />
    </form>
</div>

JavaScript

$("form").submit(function (e) {
    e.preventDefault();
    var formId = this.id;
    var divId = $(this).closest("div").attr("id");
    alert('#' + formId);
    alert('#' + divId);
    $('#' + formId).ajaxForm(function (data) {
        $('#' + divId).html(data);
    });
});