<script type="text/javascript">

function validateEmail()
{
    var validemail = document.forms["feedback"]["email"].value;
    if (/(.+)@(.+).(.+)/.test(validemail)){
    return true;
    }
    else {
    alert('Invalid email or email not filled out')
    return false;
    }
} // validateEmail

    </script>

<script type="text/javascript" src="https://code.jquery.com/jquery-3.2.1.min.js" integrity="sha256-hwg4gsxgFZhOsEEamdOYGBf13FyQuiTwlAQgxVSNgt4=" crossorigin="anonymous"></script>
<script>
function agecheck() {
    if($('input[name=age]:checked').length<=0)
    {
    alert("Please select your age");
    return false;
    }
} // agecheck

</script>

<form name = feedback onsubmit=" validateEmail() && validatename() && agecheck() ">