error to displaying name with messages in php

**i am writing a script for my project, i am facing a little bit error.

this code display only 'eligible messages', i want to showing user name also in output. pls solved it.**

**<?php
    $name = $_POST['name'];
    $dateOfBirth1 = $_POST['dob'];
    $today1 = date("Y-m-d");
    $diff1 = date_diff(date_create($dateOfBirth1), date_create($today1),);
    if($diff1->format('%y')>= 21){
        header('Content-Type: application/json');
        echo ($name);   
        echo json_encode(array('flag'=>1, 'msg'=> ' You are eligible. Your Age is: '.$diff1->format('%y').' Years, '.$diff1->format('%m').' months ,'.$diff1->format('%d').' days'));
        exit;
    }else{
        header('Content-Type: application/json');
        echo ($name);
        echo json_encode(array('flag'=>1, 'msg'=>' You are not eligible. Your Age is: '.$diff1->format('%y').' Years, '.$diff1->format('%m').' months ,'.$diff1->format('%d').' days'));
        exit;
    }
?>**

source https://stackoverflow.com/questions/73872114/error-to-displaying-name-with-messages-in-php