process.php

<?php

try{
    $pdo = new PDO('mysql:host=localhost;dbname=ajax','root','');
    $pdo->setAttribute(PDO::ATTR_ERRMODE,PDO::ERRMODE_EXCEPTION);
}catch(PDOException $e){
    echo 'Page not connected';
}
$name = $_POST['name'];
$age = $_POST['age'];

try{
    $sql = 'INSERT INTO user(name,age) VALUES (:nme,:ag) ';
    $data = $pdo->prepare($sql);
    $data->bindValue(':nme',$name);
    $data->bindValue(':ag',$age);
    $data->execute();
}catch(PDOException $e){
    echo $e->getMessage();
}

if($data->rowCount() > 0){
    echo 'Data Inserted';
}
else{
    echo 'Data cannot be inserted';
}