what's wrong with this code


Code:
<html>
<body>
<script>
var age=prompt("what's your age")
var gen=prompt("what's your gge")
if
(age>=21 && gen=male) || (age>=18 && gen=female)
{
document.write("eligble") 
}
else
{
document.write("not eligble")
}
</script>
</body>
</html>