I am learning javascript and have an assignment to prompt for an age and if too young alert, or if to old alert, or if 21 alert and redirect. This is what I have so far.



<script type="text/javascript">

var age = prompt("Please give me your age.");
var age2=21;

if (age<age2)
{
alert("You are under 21");
}
else if (age>age2)
{
alert("I believe you are too old, sorry");
}
else
{
alert("Welcome to the Club!");
window.location = 'http://www.google.com'
}
</script>



This works but I am not sure if this is the best way to do it and also, is there a way to only accept numbers and not letters?

Thanks