Use jQuery Ajax with PHP

index.html

<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>

<script>
$.ajax({
	url:"info.php",
	type:'POST',
	data:{name:your_name,age:your_age},
	dataType:"html",
	success:function(res) {
		console.log(res);
	}
	error:function(error) {
		console.log(error);
	}
})
</script>

info.php

<?php
  $name = $_POST['name'];
  $age = $_POST['age'];
  echo "Success";