Hello Can I use comparison operators after a case? Or switch only supports a direct comparison with each case of identical type?

Question

var age = 11;
switch(age){
case age <=12:
alert('You are child');
break;
...
}

Answer 1

Yes, you can use comparison operators. But, switch has to be true for age to work.
switch(true)

Answer 2

var age = 12;
switch(true){
case age <= 12:
alert('You are a child');
break;
case age < 18:
alert('You are a teenager');
break;
case age >= 18:
alert('You are an adult');
break;
default:
alert('You don\'t insert your age')
}

Answer 3

I try but it doesn't work. Please review my code and suggest the solution
Code:
var age = 12;
switch(age){
case age <= 12:
alert('You are a child');
break;
case age < 18:
alert('You are a teenager');
break;
case age >= 18:
alert('You are an adult');
break;
default:
alert('You don\'t insert your age')
}