Removing dates from old posts

Hi,

In my loop-index.php

I’ve this code

if (get_the_modified_time() != get_the_time()) {
				
				echo "<time class='date-container' itemprop='dateModified' datetime=".get_the_modified_time('c')."> Mis &agrave; jour le ".get_the_modified_time(get_option('date_format'), $the_id)."</time>";//modif
               	echo ", ";
				}
				echo "<span class='date-container minor-meta updated'>Publi&eacute; le ".get_the_time(get_option('date_format'))."</span";
				echo "<span class='text-sep text-sep-date'>, </span>";

I wish to not display publish date if post is older than N days from today (eg: 500 days)

How do i do that ?

Best