Menghitung selisih usia dengan php pd wordpress custom field tanggal lahir

datediff.php

<?php
        if ( ! function_exists( 'datediff' ) ) {
        	function datediff($tgl1, $tgl2){
        	$tgl1 = strtotime($tgl1);
        	$tgl2 = strtotime($tgl2);
        	$diff_secs = abs($tgl1 - $tgl2);
        	$base_year = min(date("Y", $tgl1), date("Y", $tgl2));
        	$diff = mktime(0, 0, $diff_secs, 1, 1, $base_year);
        	return array( 
        			"years" 		=> date("Y", $diff) - $base_year, 
        			"months_total" 	=> (date("Y", $diff) - $base_year) * 12 + date("n", $diff) - 1, 
        			"months" 		=> date("n", $diff) - 1, 
        			"days_total" 	=> floor($diff_secs / (3600 * 24)), 
        			"days" 			=> date("j", $diff) - 1, 
        			"hours_total" 	=> floor($diff_secs / 3600), 
        			"hours" 		=> date("G", $diff), 
        			"minutes_total" => floor($diff_secs / 60), 
        			"minutes"		=> (int) date("i", $diff), 
        			"seconds_total" => $diff_secs, 
        			"seconds" 		=> (int) date("s", $diff) );
        	}
        	$tgl1 = date_i18n( 'd M Y', strtotime( get_field( 'tanggal_lahir' ) ) );// custom field in wordpress. atau ganti dengan tgl lahir jika d kode php
        	$tgl2 = date("Y/m/d/ h:m:s");
        	$a = datediff($tgl1, $tgl2);
        	echo 'Tanggal Lahir : '.$tgl1; echo '<br>';
                echo 'Usia : '.$a['years'].' tahun '.$a['months'].' bulan '.$a['days'].' hari '.$a['hours'].' jam '.$a['minutes'].' menit '.$a['seconds'].' detik';
        }
?>