<!DOCTYPE html>
<html>
<head>
<title>Title of the document</title>
<style>
input {
display: block;
margin-bottom: 10px;
}
</style>
</head>
<body>
<form action="/form/submit" accept-charset="ISO-8859-1" method="post">
<input type="text" name="name" placeholder="Enter your Name">
<input type="text" name="surname" placeholder="Enter your Surname">
<input type="number" name="age" placeholder="Enter your Age">
<input type="submit" value="Send">
</form>
</body>
</html>