Node.js Hello, World.js

process.stdin.resume(); //Keep process from terminating.
const readline=require("readline"),
      rl=readline.createInterface({
	input:process.stdin,
	output:process.stdout
});
function question(string){
	return new Promise(resolve=>
		rl.question(string+"\n",answer=>resolve(answer))
	);
}
(async()=>{
	var sleep=s=>new Promise(r=>setTimeout(r,s*1e3)),
	    yourName=(await question("What's your name?")).trim();
	yourName=yourName[0].toUpperCase()+yourName.slice(1);
	while(true){
		var age=(await question("And how old are you?")).trim();
		if(/^\d+$/.test(age)){age=+age;break;}
		console.log("That's not a number!");
	}
	console.log(`Hello ${yourName}! You're ${age} years old.`);
	await sleep(2);
	console.log(`I assume you were born in ${new Date().getFullYear()-age}?`);
	await sleep(4);
	console.clear();
	console.log("Goodbye!");
	await sleep(2);
	process.exit();
})();