Javascript Assignment

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.

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

if (ageage2)
alert("I believe you are too old, sorry");
alert("Welcome to the Club!");
window.location = ''

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?

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