JSFiddle - React, Tailwind, and code Playground

JavaScript

let age = prompt('how old are you?', '');
let under = "hi";

//alert(`you are ${age} years old`);
if (age < 18) {
    alert('you are under 18!');
} else if (age == 18) {
    alert('you are 18!')  //почему не появляется, если не вписывать 18???
} else (age > 18); {
    alert('you are more than 18!')
}