<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>Hello World!</title>
<link rel="stylesheet" href="styles.css" />
</head>
<body>
Enter Age : <input type="number" id="A" placeholder="Age">
<br>
<button onclick="validateAge()">Verify</button>
<script src="script.js"></script>
</body>
</html>