Simplify/fix the code below by knowing that you can use php 7.3-7.4

user.php

<?php
/**
* Simplify/fix the code below by knowing that you can use php 7.3-7.4:
*/
class User {
    public $name;
    public $lastName;
    protected $age;
    
    public function __construct($name, $lastName, $age)
    {
        if (is_string($name)) {
            $this->name = $name;
        } else {
            throw new \Exception('Name is not a string');
        }

        if (is_string($name)) {        
            $this->lastName = $lastName;
        } else {
            throw new \Exception('Last name is not a string');
        }


        if (is_int($age)) {
            $this->age = $age;    
        } else {
            throw new \Exception('Age is not an integer');
        }
    }


    function printUserName(): string
    {
        echo $user->name,' ', $user->lastName;
    }
}

$user = new User('Matt', 'Jefferson', 34);
if ($user->age > 32) {
   $user->printUserName();
}