Age Check JS

Age Check.js

var today = new Date();

var todayYear = today.getFullYear(),
	todayMonth = (today.getMonth() + 1),
  	todayDate = today.getDate();
  	
var birthdayYear = prompt("What year were you born?"),
	birthdayMonth = prompt("What month"),
	birthdayDate = prompt("What Day were you born?");
	
if ((todayYear - birthdayYear) > 21) {
	console.log(21);
}
else if ((todayYear - birthdayYear) == 21){
  if (todayMonth > birthdayMonth){
	  if (todayDate > birthdayDate) {
    	console.log(21);
    }
	  console.log(21);
  }
  else if ((todayMonth == birthdayMonth) && (todayDate == birthdayDate)){
	console.log("HAPPY 21st BDAY");
  }
}
else {
	console.log("too young");
}